I know basically nothing about multi-sig, but I want to experiment with multi signature transactions in Peercoin. I need to do this in JavaScript. Is there a peercoinjs lib or something like this, that can do this for me?
Thanks for all the help I can get 
I think I recall reading something about someone having implemented something that could calculate the odds of someone successfully staking coins, in JavaScript. Being kind of very ignorant in this area, I never the less guess that this could prove good starting point for implementing Proof-of-Stake in JavaScript.
As for changing the reference keys, though I’m not sure exactly what that means, I would guess it’s about creating Peercoin addresses and not Bitcoin addresses. That should be pretty easy, especially since there is an online Peercoin address generator written in JavaScript.