Multiple sets of seams for multiple UVs? When UV mapping and lightmapping an asset for game use, I find that I need to erase my seams after UV mapping in order to place new seams for the lightmapping. Is there anyway to preserve them, or use two different sets?
You can mark your seams, unwrap to one UV map:

Then create a new UV map, clear your seams, designate new seams, and unwrap to the new UV map:

Then select the first UV map, and use UV/"Seams from Islands" which will re-designate seams based on the first UV map, restoring the seams that you had before.