Alright so - I have a question that I can't figure out how to Google. Polycount to the rescue (perhaps)! Is there a way to use the Layout function in Maya (Edit UVs > Layout) to layout your UVs ... but still keeping some of them stacked? For example, if you have a model with a bunch of small similar parts that you can…
To my knowledge it's not possible for Maya to remember which UV shells are stacked on purpose. If you're working with mirrored shells, you can just snap-align them back on top of each other which is pretty quick. I've heard good things about IPackThat which has the ability to group or freeze UVs so they stay together…