there is something that always bothered me.
you have an fx/generator/pianoroll/event window that isn't on top (e.g. hidden behind the playlist or the step seq) :
when you want to bring it on top by clicking its slot, selecting it in a menu, etc.... it is closed instead. and this is very boring.
(which means losing your selection in pianoroll, having to go again in menus to edit events...)