I have a feature suggestion regarding "Focus Follow Mouse."
I created this for my own personal use, so I leave it up to you whether to incorporate it into BTT.
(This applies when the "Also raise the focused window" setting is enabled.)
I used AppleScript to implement functionality similar to "Focus Follow Mouse."
When "Also raise the focused window" is enabled, a common issue arises: if a background app moves to the foreground, the app that was previously in front might become obscured.
To address this, I used AppleScript to check coordinate data via BTT; I configured it so that "Focus Follow Mouse" does not activate if the frontmost app would end up being hidden.
This has significantly improved usability.
Just sharing this for your reference.