Like benji said, the trouble with dribble is that I had to walk a fine line between adding "cool stuff" and making sure that said cool stuff was accessible without having to use a bunch of custom shaders and stuff, forcing you to retexture everything. Of course, anyone with multiple-renderer experience would tell you that you should tune your scenes for the intended renderer anyway
It's perfectly possible to write one "uber shader" that does everything, you just end up with a massive number of parameters to manage. That's the way I went with virtuaout for example, and many people couldn't get their head around that.
