Not sure if this has been asked before, I searched but didn't see anything.
What I'd like is to be able to output the rendered UVs we see in the editing window. That's exactly what I need for my application, which is trying to burn as much lighting/shadows/weathering reality as possible into the single diffuse texture maps for game assets running on an ancient game engine - this is a long-running game mod.
Right now I can screen cap it and more or less get what I need, but it would be much nicer to have a feature to do this and control the resolution and other params of the output file. And I have to think some other people working with older game engines would have the same need.
Below is what I mean, rendered output of a piece of a model that I was testing.

Unless of course that feature already exists and I'm just being stupid, I'm new to SP. But with texture export I see only the usual separate AO/normal/etc maps and no way to composite layers into single outputs.