To tell truth, this is keeping me from investing in a string library here. I would just use something in Kontakt and tweak the microtuning in the instrument via a script, or use that cubase plug in.
Also, what about long glissandi in the strings, there is a whole thing (let's just say in a film composer's bag of tricks) derived from penderecki's thing, which seem awfully tough to do here.
That's a feature request. I have no idea how you'd implement or how impossible or what, but that gets me into the string libraries, that and having some stock Arabic or what-have-you intervals and not having to base on 12T et.