Flechette is already in the game but not buyable at the ATM, it has increased AP and less damage then buckshot. 12g Slugs do not have a bulk ammo box despite buckshot and incendiary slugs having one.
What I mean by this is that you currently cannot use syringes, beakers, etc on stuff in any storage slot so you have to pull it out which is very inconvenient, since you have to fill both hands with items to just draw a chemical from a beaker for example.
Whenever PVP is being added would be nice to get player roles for these two game-modes. They are the most boring in my opinion, zombies is too easy and Xeno's can be hit or miss. In Xeno's often with a lot of the lobby dead the round can stall for a good while and its quite boring to spectate...