The double title bar problem is worked around by setting the compiz decor/decoration_match key to "!(state=mavert & state=maxhorz)" and the mouse offset problem doesn't seem to happen when windows are undecorated in this way.
This presumably works by ignoring the window hints rather than setting them, but it suggests that the problem can be solved without patching wine.
The double title bar problem is worked around by setting the compiz decor/decoratio n_match key to "!(state=mavert & state=maxhorz)" and the mouse offset problem doesn't seem to happen when windows are undecorated in this way.
This presumably works by ignoring the window hints rather than setting them, but it suggests that the problem can be solved without patching wine.