The issue is how to go about it without messing anyone’s plugin up. There has been a lot of demand for it on the forums; if I ever get a spare moment I might go and implement it.
How about an option where extra parameters are created for all MIDI CCs, pitch bend and aftertouch, and the VST3 wrapper converts those incoming parameters to MIDI and sends them to the pluginInstance? Then the plug-in would receive CCs as usual. Would that work or is there something I'm missing?