I've just discovered that Mod Tools can paint textures in 3D!!!! This resolves some major software hunting and finding. Only problem is, this simplistic procedure, in Mod Tools appears to be for smarty smart peoples whom knowed the smart stuffs only.

My weak and fragile neurotransmitters are all but subdued and clouded over when it comes to drooling at a screen full of nodes to wire and not quite comprehending why I need a weight map or what a 'weight map' is. 

Looks like I'm going to be watching that car door video over and over again.