I don't have a copy of PageStream myself but, as far as I can
remember, there is a system printer driver and drivers for several
printers that access the par port directly.
Since you have an usb printer, it might not be possible to use the par
drivers for it, but if you have an old par printer, you could check
wether it works with system and/or parallel drivers.
If one works, it is not the main app's fault, and a patch for the
system printer shouldn't be hard to do. Maybe you could contact the
programmers directly. I'm sure they'll help you if you sign a contract
saying that you'll buy the next version ;)

To add, my copy of Art Effect avoids any printing by crashing first
:(