Would probably be a cool feature. I guess the top of the line in this software area is Embertones solo strings. They based their library on this concept, recording everything without vibrato. They can be really expressive, no doubt, but there's sometimes the LFO based vibrato still annoys me, and feels a bit fake. Also controlling and programing it can take a little focus away from the performance for me, though they did a really good job, also with the TouchOSC app.
Now for most project I've actually ended setting up dimension strings with a crossfade between the non-vibrato and vibrato legato patches. I really think this creates an intimate sound. And it's nice being able to crossfade to a real played vibrato. And beside that still have all sorts of articulations available. I found this concept working best with DS which for what I know is the only full string library that has actual sampled non-vibrato legato transitions. Most libraries use their vibrato/regular legato transitions and then crossfade immediately to their recorded non-vibrato sustained sample. But this thing I hear very clearly and therefor it doesn't work for me.
Unfortunately VSL didn't sample (edit: performance legato) non-vibrato for the other string libraries, so the concept can't be applied in the same way. Let me know if you want to know more about how I've set up DS.
Best