Andi - Long delay in response here. I've been trying to make do with the inadequacies of this product, but this is not going to work.
Firstly, applying the detache is erratic. Sometimes it works and sometimes it does not. If there is any pattern to this, I have not figured it out. This is likely a Sibelius issue.
Seondly, as far as I can tell there is no way to combine detache with non vibrato. The detache sample always has vibrato.
However, even if there were a way to work around these limitations, marking detache every place where you do not have slurs, and then marking normal whenever you hit a slur is totally impractical for any piece for solo strings more than a few minutes long,.
Unless there are some obvious simple solutions to these problems, it seems that I have spent a lot of money for a very over priced and inadequate tool for use with Sibelius.
Eric