Missing Fn Space - not solved?!!
Unfortunately, the proposed solution didn't work. I think the issue is with CWS layout (CWS being Cingular/ATT). That layout doesn't have the Fn+Space in it. For example, the Hermes keyboard had a blue á ú written on the Space bar. The tilt doesn't have that. In fact, if you install the original ATT Rom, the Fn+Space combination doesn't work.
The only way I've seen to get Fn-Space back to life is not to use the layout that results from the ATT Keyboard Fix (which enables CWS layout in the Registry). However, if you use the English layouts from non ATT Roms you get Fn-Space at the cost of getting many of the other Fn keys mapped the wrong way... For example, the ! and the @ are swapped, the ; gives you a %, and so on.