Im using the Special Edition patches and I cant use any of the solo instruments for this reason. In fact, so many solo instrument libraries have exactly the same vibrato for every note. It drives me nuts. Every note sounds exactly the same. Vibrato is a powerful expressive tool that musicians use to express emotion. I use this video all the time to really demonstrate this, this is a video of a solo violin and a solo oboe backed by a full orchestra playing the theme to Schindlers List. Watch the violin player carefully, some notes, there is absolutely zero vibrato, some notes, vibrato starts at the beginning of the note, some notes, vibrato progressively increases or decreases over the duration of the note, and not all notes start with vibrato, and some notes start with vibrato and end straight. The point is, no solo string library on the market is allowing this kind of expressive control that Im aware of, I suspect because of the purity argument. That is, in order to do this, the mod wheel would have to control vibrato speed, and some other CC would have to control vibrato depth. Vibrato would have to be artifically created (that is, every note is recorded flat with no vibrato and all vibrato would be algorithmically generated).
Some libraries allow some flexibility in this regard, Chris Hein's library allows you to preprogram 4 notes with speed, depth, and start / stop times on the vibrato, but only for four variations.