I would love to see an easy way to set different tuning standards across all the V Collection instruments. For example, if I were doing a piece and wanted to use 432Hz tuning standard, I would like to be able to manually set each instrument to be in tune with 432Hz simply by typing that into a "tuning" field.
It would also be very valuable to have the ability to set the temperament to something other than the typical piano equal tempered tuning. Non-Western intervals and scales would be very welcome!