Support in solfege noteheads feature for Minor-Do

The solfege noteheads work nicely in major keys, and, for those who favor the Movable-Do/Minor-La system, in minor keys as well. But at least as many people use the Minor-Do system (in which the tonic is always Do), and for them the feature is much less useful. Would it be possible to offer a choice? (It would be a bit more complicated, as Minor-La requires only a key signature in assigning syllables.)