1 - a wallet in the next-size-up pouch size. When I put in several (credit/insurance/AAA/etc.) cards in the center, my driver's license in the front, and bills (folded) in the back section, it's hard to get anything out. And I still have to use another pouch for coins.
2 - a shorter key strap. I stapled my 8" strap so the clips butt up against each other to make it a 4.5" strap, which works very well indeed, but an even shorter one (just enough strap to attach the hooks) would be even better.