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Detailed explanation of every setting. For a quick tooltip description, hover over the buttons inside of Blender.

Import settings:

Line segmentation:

Subdivides every Segment of the G-code recursively until no segment is bigger than given value.
Needed to give enough resolution to vertex color maps and geometry modifiers.
Performance can suffer if you set the value too small and even simple G-code/meshes can become quite dense.
8-bit controllers might stutter if you print too many segments too fast.

Import G-code:

Every segment of G-code generates a polygon standing upright on its side.
Height of the polygon represents the layerheight and upper horizontal edge of the polygon is the actual extrusion path of the nozzle.
Starting from a 2D polyline (in consecutive vertex order), extruding the line in Z will result in an exportable mesh.

Export settings:

Travel speed:

Is set in mm/s. Mind that the generated G-code uses mm/min.

Extrusion speed:

Is set in mm/s. Mind that the generated G-code uses mm/min.

Flow multiplier:

Every import creates a vertex color map called 'Flow'. Enter vertex paint mode (Ctrl+tab+8) and select the active vertex color map in Object Data Properties-->Vertex Colors to change the vertex colors. On export the color of each vertex gets converted to grayscale and is used as an extrusion multiplier for that segment.
Standard range of grayscale is between 0-1, but can be remapped to new min and max values.
Black vertex will result in a multiplier of min value.
White will result in a multiplier of max value. (white is default color of new vertex color map)

Speed multiplier:

Same logic as flow multiplier, vertex color map is called 'Speed'.
Grayscale value gets multiplied by extrusion speed value.

Toolchange based on color:

Every import creates the textblocks 'T0' and 'T1' in Blenders Texteditor (Shift+F11).
Every textblock is associated with the color swatch next to it.
E.g. When the color white is found in vertex color map, the textblock 'T0' is inserted into the G-code once
and only changes when a black segment is found and then 'T1' is inserted.
This is the most experimental features and has the most flexibility, because you can store any G-code macro in 'T0' and _'T1' _ Color values of 'Tool' vertex color map get thresholded to white or black on export.

Start G-code:

Textblock 'Start' contains G-code commands inserted at the beginning of the G-code file. Has the following defaults:
;nozzleboss
G28 ;homing
M109 S200 ;wait for hotend temp
M190 S50 ;wait for bed temp
M83 ;relative extrusion mode (REQUIRED)

End G-code:

Textblock 'End' contains G-code commands inserted at the end of the G-code file. Has the following defaults: G10 ;retract
M104 S0 ;deactivate hotend
M140 S0 ;deactivate bed
G28 ;homing
M84 ;turn off motors

Export G-code:

G-code file is created in the same folder the .blend file is saved in.