May not be the info you are looking for, but I'll respond.
For DiscT@2 to give good results, only certain types of media using certain dyes will give good results. (No, I don't remember which ones off-hand.)
These T@2s can only be done on unused areas of the disc. So, if you are like me, and an archiving data, and intend to use the entire disc, you'll never have a chance to make a T@2.
Simply put, for me, since I expect to use an entire area of a disc for data, I expect DiscT@2 to be a feature that I'll NEVER EVER use.
I'll re-think my position if they ever figure out a way to do it on a full disc of data.