Nice to see something new, may be usefully :]
I was playing around with some stuff and I think that latest versions have some curious bug

if you use "SETLOOPSUB" for mail loop you can't move app window around (not fullscreen mode), and trying to do that will hang the process :/ Even this simple code will have such issue:
ALLOWESCAPE TRUE
LIMITFPS 60
SETLOOPSUB "main_loop"
END
SUB main_loop:
IF (KEY(01)) THEN END // if escape key then end app
ENDSUB
When Debug is enabled you just can't move the window, but app will still work ok. When using do/loop as main loop with sleep there is no such problem. Checked on Windows 10 (didn't test on other pc, os version), can anyone verify that?