Have Swipe L/R/U/D and Drag L/R/U/D (+/- inversion )have some consensus among users/programmers?

I assume left swipe : begin from "outside of Left side of LCD" to "middle of LCD" (or this is swipe "to right")

Swiping from left towards the right is a right swipe.

then leave down swipe for closing app/return to clock/launcher

I'm not sure I've ever seen a device where down swipe went back?

I'm afraid this is just one of those things - different people have different ideas of how to interact, and they tend to implement this in their apps differently. We try to be open to all kinds of new apps, and don't want to impose 'UI Guidelines' that make it even more difficult for new contributors.

I don't think it makes sense to telling other app users to totally change their app because 'I installed app X and now doesn't work quite right in this case'.

For global functionality, there is Bangle.setUI. For instance we have back field, which is implemented with the button (and top left icon) normally, but if someone overrides Bangle.setUI it can be implemented with a swipe in every app instead... But not all apps do this and there are far more complex interactions which it'd be hard to handle in setUI.