There's no control on the vibrato, and it's mostly non vibrato (without being flat), more suited for an ensemble sound. And to be honest, I prefer that, every library with vibrato control takes time and work to sound right. In most cases, I just want to play quickly and get satisfying results, otherwise I lose my ideas
Yeah, you can use a muted trombone performance patch for jazz, if you cut the hall and section mics and the reverb, but that depends on what kind of a result you're expecting. I think it's better in those cases to use a library made for that genre, with falls, doits and such.