No. PS is blind, deaf and dumb in the UV department and doesn't know any advanced tricks.
Yeah Mylenium is correct. Photoshop can create the UV texture, but has no way of really altering the UV map. It just received a new feature for UV's but I have not tested it yet nor would it help in this situation. But at least they are/or were working on UV issues. I guess we will see what the next update brings.
Most 3d apps provide ways to alter the map so it may be worth your time to real the manual for that app.
Also UV Mapper is a nice alternative, not sure it will do everything you need, but at least it can do basic editing. (I think it works on obj files only. It's been awhile.)
PS UV editing is a no-go indeed. If you need a very powerful free option: Blender. Blender has great UV mapping tools, and they are relatively easy to use (once you have learned the basics of Blender).
There are many video tutorials available online that explain how to uv unwrap a character or other models. Here is a good beginner's one: