it's a client method. which of course doesn't work on a server. which is probably caused by the intialization being called in the mousetweaks class, without any proxies involved. guess you didn't understand that, but here's the conclusion: it's ment to be a client-side mod.
ps: please excuse me for my boastful moments. i was just trying to help :p
pps @Yamanox: you, i like you. especially your profile picture.