I just checked this. It is possible to assign a symbol to a playing technique.
Indeed you can, but not for build-in symbols. For exemple, you cannot assign the Dorico trill or tremolo glyphs to a trill or tremolo sample. Actually, you can but since they are associated to an automatic playback, you’ll have Dorico generating a trill or tremolo on top of your sample. For the trill, it’s not a big problem since you can deactivate playback. So you can use the Dorico trill glyph for visual, add your own made glyph and hide it (for a reason I don’t understand, I had to create a “trill 2” playing technique for my own glyph trill). But tremolos cannot be eliminated from playback, only the notes the tremolos are attached to. If you deactivate playback to avoid Dorico’s tremolo simulation and add your own tremolo glyphs, you have no notes left to trigger it. With one note tremolos, you can either write the notes without the tremolos and add your glyph, but that implies that you’ll have to manually position them, or use the procedure I described earlier with an added staff. At least, it’s the solution I found.
By the way articulation are different from glyphs. You should not have any problem associating the relevant playing techniques (legato, staccato, tenuto…) with your samples, but you might have to change the default note lengths Dorico associates with theses articulations. The biggest problem is when you cumulated more than one technique… For exemple, a tenuto might be written in different ways : tenuto, staccato+legato, staccato+tenuto… So if you have a sound associated with legato and one with staccato and write a passage in staccato-legato, Dorico will do something like using the legato sound for the first note and then the staccato. Anyway, you’ll never get a tenuto sound unless your maps have an entry “staccato+legato = tenuto sample”. There’s also a huge problem with the fact that some symbols can have different meaning. The most obvious is the legato slur. Of course it can mean legato, but also bowing, respiration, phrasing… which might or not be legato. What’s absolutely sure is that once you’ll have gone through all the possible combinations and found ways to compensate for VSL incoherences in their instruments, you’ll be ready for the madhouse. See you there!