Fullscreen mode with hovering toolbars
Especially on 13" laptop screens and such, LaTeXila's vertical screen spage usage is somewhat inefficient. Sometimes I would like to be able to press F11 and enter a smart fullscreen mode like in Gedit or Firefox, where the window decorations, the statusbar and toolbars are hidden; the toolbars float nicely above the screen and can be revealed by pressuring the mouse cursor against the top edge of the screen, so nothing of value is lost. You could steal gedit's code to do that :)