Pokerstars Automatic Check on Fold

Do you mean when you're in the big blind you cant quick fold? Yes that's forced by the software or else you'd be folding hands when people just limp in and you could see a free flop. You could think of one or two other reasons for it too.

When in the big blind, yes. But also any time I'm able to check. In a normal game of poker it's obviously silly to fold when you don't have to pay anything to see the next card. But in ZOOM poker doing so allows you to immediately move on to a new table and hand, which is essentially the whole point of the game mode.
I was allowed to do this when I initially downloaded the software, but not knowing of ZOOM poker at the time, I set it to Check instead, if possible, when I try to Fold. And now I see no way of changing this setting anywhere in the program.

There's a setting in pokerstars somewhere if you look for it.