First of all I must say that FastPictureViewer is a sensational, incredibly useful tool. I never would have thought that I would ever get a grip on my ever-increasing image collection, but now I do! Thank you!
So far, I'm quite happy with FPV's possibilities. However, there is one additional possible workflow that I would like the most: You enter your review folder and advance forward, copy the wanted items, as it is now. When you leave the folder, I suggest there should be an option to delete every picture that was reviewed in this session (the wanted ones have been copied, so all reviewed can be deleted). I believe that this mode should apply to the needs of many users.
But anyway -- thanks! I've tried so many viewers with their "smart" indexing etc. etc., but they all are only slow -- FPV is fast, which is the solution!