(and key and velocity tracker device should be also possible to target just attack, decay etc because for now it influences its level and it is not wanted in every situation (there is workaround, macro attack, create macro device and assign velocity tracker to its macros… but it takes one macro space :-(().
So, you are basically suggesting that the modulation devices that are categorized as “meta devices” in the DSP effect-device section get some sort of rudimentary routing capabilities? This exact thing is/was being discussed here: https://forum.renoise.com/t/modulating-modulation/39900