Great app. I use a closed source app (Automate) for custom keyboard shortcuts, but if KeyMapper implements this feature I can replace Automate:

Action(s) that allows for clicking/tapping items in other apps. There can be a button to record the interaction in the other app so KeyMapper knows what to click. This will be good for apps that use Android provided buttons, switches, and menus. To implement this, I'm guessing that while KeyMapper is running in the background it will need a way to keep track of the current app activity so that custom shortcuts wont bleed between apps.

Another idea would be if KeyMapper fails to detect any clicking actions while recording the interaction, it could fall back on clicking a user designated X,Y coordinate on the screen. This might be useful for apps such as games that don't use Android provided buttons, switches, and drop menus.