are there any python scripts that enhance poser 4's rendering capability. For example, a script that let's you add line weight to .avi cartoon renders or less posturization less shadows etc etc. Is it even possible for a python script to do that? If i had any programming ability i'd be all over writing a script like that.

Not directly. It would be possible to set up an entirely separate renderer in Python using OpenGL systems or something like that, but the result would almost be a new freestanding program, not really Poser any more. One idea that would be possible and maybe worthwhile: Python could examine aspects of each frame and set the lighting (including shadow parameters) to compensate. For instance, if the average brightness went below a certain threshold, the lighting could be altered to decrease the shadowing.

what about a render plugin like the ones for lightwave, 3dsmax, etc. Couldn't something like that be made for poser