Enhance overlapping mouse keys control (#23341)

[jxz12]

Enhance the overlapping mouse key press acceleration (introduced in qmk#21494) with user preprocessor controls.

Description

Cherry-pick of the commit in QMK pull request qmk#23341

Types of Changes

• Core
• Bugfix
• New feature
• Enhancement/optimization
• Keyboard (addition or update)
• Keymap/layout/userspace (addition or update)
• Documentation

Issues Fixed or Closed by This PR

Checklist

• My code follows the code style of this project: C, Python
• I have read the PR Checklist document and have made the appropriate changes.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have read the CONTRIBUTING document.
• I have added tests to cover my changes.
• I have tested the changes and verified that they work and don't break anything (as well as I can manage).

[jxz12]

I am in contact with Mike Bates in Customer Service and our investigations revealed that this commit is needed to fix mouse key behaviour in Oryx.

I'm not sure what the proper procedure is for making a PR here (e.g. is firmware24 the correct target branch?) but I am happy to update the PR accordingly.