So, if I’m understanding this correctly, this would be macro controls in the form of additional sensors? I think that’s a nice idea.
Also, what you’re listing under ‘the future’, I’d consider essential for this feature in order to be really useful. What I’d like to see, is 4 sliders in a docker which optionally can be arranged as 2 x/y controls.
Such a feature could solve a problem that I’m running into all the time: brush variants. Instead of having to save umpteen versions of the same brush with just some small differences, a single preset could cover a whole range of variations.
Of course setting the macros up properly doesn’t make the life of brush makers easier 
but would be well worth it imho. The number of presets in some bundles could be drastically reduced, as not every variant needs its own preset. Users, who are uncomfortable with adjusting settings in the brush editor directly, now could dial in the desired brush behaviour/properties with just a few intuitively named controls.