EDIT: Actually, just ignore this one. Belts don't natively support quality scaling and any mods which implement it do so by defining additional prototypes.

I'm mostly making this thread because I know somebody else will at some point. I'm no particular fan of Quality, so you can ignore this if you wish.

Nothing in the code currently acknowledges the quality mechanic. I did some basic checks for you and nothing seems critically broken in that respect - the mod won't delete or produce quality belts for free.

I know quality belts don't normally do anything, but mods like Belt quality exist which changes them.

Alt + Scroll-wheel is the standard game shortcut for changing quality.