Had one of those forend pump ones (Crosman 760, I believe). The successive ten-pump impacts when the handle closes after a dozen shots or so made it unpleasant to use for much target practice --it started to hurt my hand enough that I took the pain-warning to not use it for practice. It's also noisy to pump when the handle hits the barrel on closing --clank-clank-clank-clank.
For one-shot deals like just taking care of pests, it's pretty good, accurate enough that I put a scope on it. but man. I didn't like pumping more than about thirty strokes on it for three shots.
This may have been just mine, but it didn't hold the ten-pump pressure for very long, so you have to go clank-clank-clank-clank again just before shooting... which makes a suppressor superfluous anyhow.
No, you don't have to pump it ten strokes per shot, but for any distance, it's necessary unless you can consistently compensate for the rainbow trajectory.
Not a problem for deer-sized targets, but for garden rats and birds, you'll miss more than make clean hits at any practical distance, where you kinda have to pump it ten times. At that pressure, it will do more than "discourage" the small garden-thieves. It will kill them, and not too humanely, either.
Terry