Currently not, because for the joinlink to be generated, the teamspeak class has to be instanced and this can only happen at one point atm.
I'll see if I can realize this.
Further information besides the userlist is also not possible at the moment, since longer querys on every page generation mean more serverload.
The next thing i'll implement is a caching system, so the ts server has to be queried only every x minutes, then it will be no big deal to display more imformation