As of now, you can change cargo/speed multipliers manually in main menu - not sure if any other stats even exist, but these ones could've been tied to Quality mod if it is loaded in, or something like "quality affects speed" and "quality affects cargo". From what I recall, mods can cross-check if other mods are loaded in - but not sure how difficult it is to implement, along with how quality scaling even works. So, could you consider including some sort of interaction with quality at some point in the future?

I have thus far found no way to allow quality to affect other things other than what they coded it to affect.
If you know of how to do it, please enlighten me so I can abuse...er implement it poste haste.