Me neither know how it works on Maemo but it should be doable. Be cause it is doable under Linux.

Also it should be under a trigger. (i.e. no float automatically when swiping. Maybe with a designated key on the keyboard or under the "widget customizing mode".

If it is put under a trigger it could be usable. I am thinking Gimp.. or just while browsing. But then the problem would be the that the maximized widow would be to small (i.e just a desktop).