image size per texture, and export preset per uv-set

[Silas Merlin]

I often find myself using almost solid color roughness and metalness maps straight out of 3Coat because it's convenient (I'm lazy?), when these could be resized to 128x128 or even 4x4 pixels.
The trouble is, if I understand correctly, once converted and loaded into a graphic card, a 2048x2048 texture will take up just as much VRAM whether it is crammed with data or if it's a solid color.

Therefore, my request is to be able either at export or from the textures menu to set a texture size not just by UV-Set, but also by texture.

A related issue is this :
what if I have a character that requires an alpha channel on the diffuse only for its eyelashes ?
The way 3dCoat works, I have to first export everything without alpha, and then export everything with alpha, and then sort out the textures I really need.
It would make things more convenient if you could export uv-sets with different presets.

Thanks for reading and I hope these changes will be taken into consideration.