Thank you for your feedback.

I have added the Windows implementation of -activerelief in bug-43b596451e].

Regarding macOS I think this feature cannot be available since DrawMenuEntryBackground() is an empty procedure, probably because the native menues are used on this platform.

I will have to write a TIP and get it voted before I can merge.

On the other issue you saw with activeborderwidth != borderwidth, yes could you please open a dedicated ticket, and specify the platform where this problem happens (because I don't see any problem on Win). Thanks!