diff --git a/lib/utils/settings.js b/lib/utils/settings.js
index ac52b49610..42040591e5 100644
--- a/lib/utils/settings.js
+++ b/lib/utils/settings.js
@@ -23,7 +23,8 @@ export const useNativeCustomElements = !(window.customElements.polyfillWrapFlush
  * `rootPath` to provide a stable application mount path when
  * using client side routing.
  */
-export let rootPath = pathFromUrl(document.baseURI || window.location.href);
+export let rootPath = window.Polymer && window.Polymer.rootPath || 
+  pathFromUrl(document.baseURI || window.location.href);
 
 /**
  * Sets the global rootPath property used by `ElementMixin` and
@@ -51,7 +52,8 @@ export const setRootPath = function(path) {
  *
  * @type {(function(*,string,string,Node):*)|undefined}
  */
-export let sanitizeDOMValue = window.Polymer && window.Polymer.sanitizeDOMValue || undefined;
+export let sanitizeDOMValue =
+  window.Polymer && window.Polymer.sanitizeDOMValue || undefined;
 
 /**
  * Sets the global sanitizeDOMValue available via this module's exported
@@ -70,7 +72,8 @@ export const setSanitizeDOMValue = function(newSanitizeDOMValue) {
  * scrolling performance.
  * Defaults to `false` for backwards compatibility.
  */
-export let passiveTouchGestures = false;
+export let passiveTouchGestures =
+  window.Polymer && window.Polymer.setPassiveTouchGestures || false;
 
 /**
  * Sets `passiveTouchGestures` globally for all elements using Polymer Gestures.
@@ -88,7 +91,8 @@ export const setPassiveTouchGestures = function(usePassive) {
  * disallowed, `<dom-bind>` is disabled, and `<dom-if>`/`<dom-repeat>`
  * templates will only evaluate in the context of a trusted element template.
  */
-export let strictTemplatePolicy = false;
+export let strictTemplatePolicy =
+  window.Polymer && window.Polymer.strictTemplatePolicy || false;
 
 /**
  * Sets `strictTemplatePolicy` globally for all elements
@@ -107,7 +111,8 @@ export const setStrictTemplatePolicy = function(useStrictPolicy) {
  * getter and the `html` tag function.  To enable legacy loading of templates
  * via dom-module, set this flag to true.
  */
-export let allowTemplateFromDomModule = false;
+export let allowTemplateFromDomModule =
+  window.Polymer && window.Polymer.allowTemplateFromDomModule || false;
 
 /**
  * Sets `lookupTemplateFromDomModule` globally for all elements
@@ -127,7 +132,8 @@ export const setAllowTemplateFromDomModule = function(allowDomModule) {
  * If no includes or relative urls are used in styles, these steps can be
  * skipped as an optimization.
  */
-export let legacyOptimizations = window.Polymer && window.Polymer.legacyOptimizations || false;
+export let legacyOptimizations =
+  window.Polymer && window.Polymer.legacyOptimizations || false;
 
 /**
  * Sets `legacyOptimizations` globally for all elements to enable optimizations
@@ -144,7 +150,8 @@ export const setLegacyOptimizations = function(useLegacyOptimizations) {
 /**
  * Setting to add warnings useful when migrating from Polymer 1.x to 2.x.
  */
-export let legacyWarnings = false;
+export let legacyWarnings =
+  window.Polymer && window.Polymer.legacyWarnings || false;
 
 /**
  * Sets `legacyWarnings` globally for all elements to migration warnings.
@@ -160,7 +167,8 @@ export const setLegacyWarnings = function(useLegacyWarnings) {
  * Setting to perform initial rendering synchronously when running under ShadyDOM.
  * This matches the behavior of Polymer 1.
  */
-export let syncInitialRender = false;
+export let syncInitialRender =
+  window.Polymer && window.Polymer.syncInitialRender || false;
 
 /**
  * Sets `syncInitialRender` globally for all elements to enable synchronous
@@ -179,7 +187,8 @@ export const setSyncInitialRender = function(useSyncInitialRender) {
  * observers around undefined values. Observers and computed property methods
  * are not called until no argument is undefined.
  */
-export let legacyUndefined = false;
+export let legacyUndefined =
+  window.Polymer && window.Polymer.legacyUndefined || false;
 
 /**
  * Sets `legacyUndefined` globally for all elements to enable legacy
@@ -197,7 +206,8 @@ export const setLegacyUndefined = function(useLegacyUndefined) {
  * Setting to retain the legacy Polymer 1 behavior for setting properties. Does
  * not batch property sets.
  */
-export let legacyNoBatch = false;
+export let legacyNoBatch =
+  window.Polymer && window.Polymer.legacyNoBatch || false;
 
 /**
  * Sets `legacyNoBatch` globally for all elements to enable legacy
@@ -216,7 +226,8 @@ export const setLegacyNoBatch = function(useLegacyNoBatch) {
  * fire change events with respect to other effects.  In Polymer 1.x they fire
  * before observers; in 2.x they fire after all other effect types.
  */
-export let legacyNotifyOrder = false;
+export let legacyNotifyOrder =
+  window.Polymer && window.Polymer.legacyNotifyOrder || false;
 
 /**
  * Sets `legacyNotifyOrder` globally for all elements to enable legacy
@@ -233,7 +244,8 @@ export const setLegacyNotifyOrder = function(useLegacyNotifyOrder) {
  * Setting to ensure computed properties are computed in order to ensure
  * re-computation never occurs in a given turn.
  */
-export let orderedComputed = false;
+export let orderedComputed =
+  window.Polymer && window.Polymer.orderedComputed || false;
 
 /**
  * Sets `orderedComputed` globally for all elements to enable ordered computed
@@ -270,7 +282,8 @@ export const setCancelSyntheticClickEvents = function(useCancelSyntheticClickEve
  * eliminates most of the tax of needing two elements due to the loss of 
  * type-extended templates as a result of the V1 specification changes.
  */
-export let removeNestedTemplates = false;
+export let removeNestedTemplates =
+  window.Polymer && window.Polymer.removeNestedTemplates || false;
 
 /**
  * Sets `removeNestedTemplates` globally, to eliminate nested templates
@@ -292,7 +305,7 @@ export const setRemoveNestedTemplates = function(useCemoveNestedTemplates) {
  * such as `modelForElement` will not be available for nodes stamped by
  * `dom-if`.
  */
-export let fastDomIf = false;
+export let fastDomIf = window.Polymer && window.Polymer.fastDomIf || false;
 
 /**
  * Sets `fastDomIf` globally, to put `dom-if` in a performance-optimized mode.