I'm surprised the menu didn't work - obviously the display isn't treated as mouse input...
I did some tests with GLB and the touchscreen, with SYSTEMPOINTER FALSE everything is screwed up (only a small part of screen is handled like the touchscreen, so mouse is moving to fast, ot of screen, hard to describe...), so its unusable, but with SYSTEMPOINTER TRUE everything works fine. So plz add an option to switch to systempointer.