Arrows with different effects were part of the original plan for the game, they were never included though. Hell I think you can even still see it on the official FFXIV site lol. Status arrows would be good, or any ranged class dealing status effects would be nice.
Reduction of AoE radius was kind of in Monster Hunter with the tail swipe. If you cut the tail off, the radius would be reduced due to the now smaller tail. It wasn't super noticable but in some cases you could tell it was definitely reduced.