I don't like the gamey feel of these abilities.

Why can't I cleave with a Greatsword in a big arc as often as I like if I'm surrounded by goblins? Why can't I target someone's foot with a bow every time I want to slow them down? Being able to do those moves exactly once per short rest feels silly and arbitrary.

Special attacks could be balanced to have unlimited uses. Much like in NWN (3.x) you can use Knockdown or Disarm as much often you want but it comes with a penalty. The penalties can be attack modifiers, or drawing an AoO or basically anything. It's also weird you can cycle through each Cleave, Bash and Pinning Shot but you can't Bash three times.