I used Qt a bit and while it is not all that bad, like you I ended up "tweaking" it to make it better. I was more into the 2D side of things as my cheap Nokia doesn't support 3D. Aside from modifying some standard C headers to get vsprintf support, I didn't have much of an issue porting my own framework over to Symbian. Then again, I only used Qt for UI and nothing else.
It looks like you put in fair bit of work to build your module around Qt. Have you released your game to the Ovi Store? Is the framework being used for other projects right now? Since my phone doesn't support 3D, I don't really know what sort of 3D games are there for Symbian.
Also, have you heard that Nokia is now partnered with Microsoft to release WP7 devices? While I've heard some vocal Symbian devs scoff at it, I often wonder if Symbian's future is up in the air right now.