http://bugs.winehq.org/show_bug.cgi?id=29504
--- Comment #3 from Yuki cute.dark.sorcerer@gmail.com 2012-01-02 04:02:11 CST --- (In reply to comment #2)
Why do you think it should be possible?
it's a given option in winecfg; also, if you look at the screenshot I added as 1st attachment, you can guess, that without window border, the virtual wine desktop would completely fill my debian desktop.
It's just cosmetic, but I am certain that I'm not the only one using this function ;)