It would be nice to see changelings ...changed. I don't think they are in the best of spots in their current incarnation. They start off stronger than vampires do, but lack any real ability to grow stronger. I don't understand why there is a cap on absorption's forcing you to change into someone else to keep absorbing - it seems very arbitrary. Because they start off with so many evolutions, there is no reason to do anything other than kill their 1 target, and then sit idle for the rest of the round. Whereas vampires are constantly hunting for new targets, and it gets the whole crew a bit more involved.
Clings are also pretty weak because of the handcuffing thing, all it takes is one (or two stuns if cling has sacs) and a handcuffing, and the cling is pretty much dead.
You can usually tell a changeling round because of how boring it is, barring security dragging the occasional body to the incinerator. A better version would involve:
1) Getting rid of DNA absorption sting. Its a pussified mechanic and serves no real purpose other than wracking up your absorption count for greentexting.
2) Start with fewer evolution, give more evolutions with each victim you absorb. Results in clings balancing being stealthy and weak, or hunted but strong.
3) Introduce blood testing ala goonstation/the thing. Allows the crew to get involved, allows more interaction between people accusing each other of being changelings and demanding blood tests. Will really ramp up the sense of paranoia involved which is currently missing.