Quote: "can you use one shader for everything in your game and have the diff objects have different textures? so you could write one complex shader that would be used for everything so you could achieve a particular overall affect like unified shadows or something of that nature or cell shading? "
In theory it seems like there is no reason why you couldn't, but all I have are theories
Lee's diaries alude to make sure FPSC has some level of compatability with other shaders outside of the four included with the EA release BUT then again many beta testers have said that the shaders have a very subtle effect so it may be that even the most prominent shader (cell shading for example) may not do exactly what you expect it to do. A lot will depend on how FPSC processes shaders (if I'm even understanding the process correctly)
Keep in mind too that your question can't really be easily answered by a beta tester (heck it can't easily be answered by anyone unless they are willing to create a complex shader and apply it to a whole bunch of things and test out a level with walls, objects, entities, etc.)
This is one of those things that you may very well have to attempt yourself after the software is released.
Sounds like an interesting idea though (if it will work)
The artist formerly known as PogPogo
Golgothica: An FPS Sci-Fi/Horror Game - www.Golgothica.com