Steve, a new firmware version is coming real soon now. It will address lens-specific problems.
And to answer one of your original questions, on the firmware you are using, you don't have the option to optimize for specific lenses. With the new firmware, you will have many optimization options. The upcoming version of Photo Desk update has also been optimized for much better performance (at least on a Windows XP system).
I don't know what day the firmware will be released, but it shouldn't be much longer. I think that you will like it a lot.
Cheers,
Charlotte
http://wordsandphotos.org