I'm afraid the devel theme translates very badly to Maemo 4, you could practically only re-use its worst parts. If anyone wants to have a go at it, go ahead, but I wouldn't really see the point to be honest.

Also, devel themes have been much improved since the SDK release, so I would wait until the final release. I will make sure that they are in a good state and at least available as a download somewhere. I put a lot of effort into those, and I believe some people will like them.