@Miguel_Prida hello,
I think some triple stops /three voices chords/ could be achieved in legato if the fingers a placed on three adjacent strings, with a little bit more pressure on the bow.
The glissando technique can be assigned in the Expression Maps, but unfortunately it can’t really trigger any keyswitch or CC… There is a workaround in order to make glissando and portamento work.
You could download the template for Cremona Quartet and check both the README and the Expression Maps. Actually the gliss/port depends on the Velocity of first note of the two and this can be set in the Expression maps.
Cremona Quartet Template
Best regards,
Thurisaz