Also a mix knob in bus compressor and compressor. A parallel mix knob already would open up a lot of new possibilities. The only difficultly in implementation here might be the time compensation of the dry signal to match the PDC of the device. Do the compressors upsample and produce intersample stuff? Maybe then it would be more difficult, what do I know. But does not sound like hard to implement, from dsp noob programmers perspective.