I don't have any particular direct use cases in mind currently, but I was thinking the other day that it would be really cool if BetterTouchTool was able to integrate with Apple's WidgetKit (or other method if it exists) to be able to put content on the macOS Notification Center (aka: 'right hand widget bar' that can slide out from the right hand side of the screen)
A few resources I recently saved for exploring it for my own dev efforts:
- Widgets, complications, and Live Activities - Apple Developer
- Apple Developer Documentation
- All Videos - Videos - Apple Developer
Meet WidgetKit | WWDC NOTES
It would also be useful to have access to Small, Medium, and Large widget formats (depending on what functionality can be supported) for better flexibility in their layout/usage.