Utensil Poker color change was already proposed, but it wasn’t a big hit.
Problem with Utensil Poker
Speaking of layers, the way you described it is how it should be always. But I’m not sure if now it isn’t this way.
Recoloring weapons yourself is a no from me. It’s kind of ruining them. I mean… imagine the green neutron gun being red. Also what about weapon gifts?
As of outline. Right now I’m against because contours aren’t exactly nice to look at. They make things more like drawings. Or dare I say, doodles.
EDIT:
I spent 1 minute in paint and made this visualization which proves my point and I don’t exactly see how it could be improved. Negative outline would be even worse and dynamically changed outline could make the game laggy (that’s speculation, but we know that engine is limited):
