Multi selection of DSP lanes, reflected in the API
I would like to suggest multi selection of DSPs in the dsp lane and mixer view, reflected in the API. This would make a lot of new tools possible. You can already somehow emulate multi selection of DSPs in the api, but it will be ugly.
Route midi / note data to the fx chains
Then we could put VSTis into the FX chain, setup a whole instrument setting including fx, and parallel routing and then put it into a preset. Also then you could trigger multiple instruments at once with a single note. The abstraction layer instrument / fx chain could be used with its full potential.
As a bonus, the whole VSTi/VST layer could be activated for Redux, too!