Oh men...that part with bump mapping and cell shading, would be great!
What?
Sorry to be the bearer of bad news, but automatic (ie, done on the plugin level using the diffuse map) bump-mapping will not be a reality with anything, ever. There's almost no way for any plugin to 'see' the image and realize that one part should appear either extruded or indented, and apply positive or negative bump to it.
Something like bump mapping would definitely require a whole new project (similar to these retexturing projects) in which almost every texture would need a 'bump map,' which for this case would probably involve a neutral grey image, with whiter areas being indented and blacker areas extruded by whatever degree. This, I don't see happening, for a few reasons...
-Bump mapping and cell shading? They are really two completely different methods of affecting the way a texture reacts to light (usually
real time light, but for cell shading this isn't so necessary). Having one would ruin the other.
-Isn't the N64 emu scene based around low-end-ish PCs? Both of these methods eat up quite a bit of CPU power, particularly in computing the cell-shading 'ink.' (also known as the black outlines)
-Using bump mapping would really step away from any remaining connection to the original 'look' of the N64 which, even though there is demand for an alternate 'cartoony' look, the more popular pack remains the one that stays very close to the original game.
Anyway, I don't see bump-mapping gaining as much support around here as high-resolution retexturing or even cell shading, and I really doubt it'll be pursued by the plugin developers (it is, after all, a huge amount of work).