The changing perk works but u can change the perks only when trader open...
Anyways I got some suggestions:
1. Perks FOR SPECIMENTS! They got the perks of humen, and it kinda sux when u r commando cuz u c health of Zeds... U shall make some alternate perks for zeds, like Firebug = 25% fire resistance + 1 flaming grenade, 25% more chance if there is Husk it's u! ^^
2. make better voices, like Scrake's Hehe with his "I like trousers"
3. Speciments huds, like they can see health of other speciments-players ^^
4. Some lighting resistance (like the speciments look on the light, all screen goes like or yellow or white... kinda annoying)
5. Husk and Patriarch WALKING NOT MOVING FEETS while shooting... I think u shall make them unable to walk when shooting/healing...
6. Q for Patriarch healing wouldn't be that confusing... >.>