Congratulation, this is really a great piece of software! A question for you: would it be possible to add ICS support? There is an ICS package available from Wolf Faust on: http://www.ics.coloraid.de/
For now I still need to use fxPaint for now because through fxScan it uses directely ICS. IMHO calibrated scans are the only way to get a professionnal quality results of images which reflects the original's and that's what is wanted.
What do you think? I'm sure it would be much benefit for everyone, not only professionnals!