http://bugs.winehq.org/show_bug.cgi?id=6971
--- Comment #224 from Tomasz Sałaciński tsalacinski@gmail.com 2009-01-27 17:33:34 --- (In reply to comment #218)
Mouse is NOT behaving normally in non-exclusive mode.
While in exclusive mode, mouse is grabbed and no other application can use it in exclusive mode. In non-exclusive mode, the mouse is grabbed too, but can be restored for other applications (for example by pressing alt-tab). In both cases, mouse IS grabbed. It's not grabbed in foreground and background modes only.
Lots of games are using non-exclusive mode to allow alt-tabbing out of them, it's not because of some bugs.