That is exactly the point I was making above. Obviously server-side scanning cannot be infinitely customizable, since it is based on pre-programmed scans.
Oh I see, I emailed them once about having the 5min volume in #shares rather than in % and they mentioned they can give me a custom formula for that but only for paid versions
I posted this in another thread: If you have a Think or Swim account, you can use their Trade Flash, which is FREE. You really shouldn't have to pay for filters because your broker should have software that can do most of what a filtering software can offer.