Surely it wouldn't take much to program support for rewrites.
Utilize URL Rewrites?
Yes [ ] No [ ]
*If yes, please rename htaccess.txt to .htaccess
Any server that has GD, ImageMagick, MySQL 3.23+, PHP 4.0.2+ on it would very likely support rewrites too. I mean, practically every decent host allows them, and if anyone is using a host that doesn't - they're getting robbed and need to move. Anyone who is going to pay $129 for a script (+ $99 brand removal) would surely be hosting their site on a server that allows rewrites. PhotoPost scripts are reasonably intensive, and rewrite accessibility is not the first thing on the list of needs to be able to run the scripts.
Just food for thought, instead of just writing it off as: can't possibly be done - go sort it out yourself sort of thing.