For sure! Definitely looking into more lighting options, and a billboard shader is a neat idea. So is a flipbook shader. Do you know what specifically you would be looking for with an N64 shader that's different to the PSX shader? I'm preparing a new update and more of the PSX stuff (like affine textures) will be toggleable.

I've updated the pack for the Forward+ and Deferred rendering paths, with support for additional point and spot lights, and stuff like vertex colors. Gonna work on adding even more features over time!