P: +/- hot key support for quick adjustments

So an extremely useful and time saving feature of Lightroom classic is missing from CC and is stopping me from switching entirely (and therefore spending more on cloud hosting); the + and - hot keys that could be mapped to any adjustment to super quickly tweak a particular adjustment. 
In my workflow I use it to quickly adjust exposure as I go through my event photos, generally my presets get me 90% of the way there and I just need to tweak exposure a little. Currently on CC I need to lift my hand from the keyboard that I was using for navigating/rating photos to the mouse/touchscreen in order to change exposure, which disrupts my flow and increases editing time. This one small tweak would make a big difference to my workflow and in turn make me fully switch to CC.