@jim said:
TIG, what if the user installed Pro, then let it expire? Does the Pro reg key still exist? I think it might.
I just tested that. It seems the registry keys get deleted if you uninstall SU Pro. I will use this to check for my program. It's not ideal, since you could probably have a pro version running as a free version, but better than nothing 
Thanks!
I think the topic says it all: I need to check in the registry whether the pro or free version is installed. Can anyone help me?
How do you Import/Export? With a plugin or with the C++ SDK? The have different UV values.
What I'm trying to say is this:
If you add Q*(Face Normal) to each of your points you get a new face.
If you align your texture to this new face but assign it to the old face it should be distorted.
PS: sorry for my bad English... I'm not a native speaker. 
Here is my guess what the Q value could be used for. Unfortunately I don't have time to test my hypothesis.