I came across this site today http://www.pullin-shapes.co.uk/index.htm - its about the LSCM unwrapping stuff. In the standalone version you are able to see through hot and cold colours if there is any UV stretching or not - I thought it was pretty cool. Is anyone able to tell me if this is being implemented into Blender?
I emailed the dude that produced the software and he said that that part of the software was the simplist bit of code in there. Hes not a blender developer but maybe we could put it in as a feature request.