Usually with mouse tweaks I was able to just take a single item per scroll wheel "click", but now if I just do a single "click", it doesn't work, I have to scroll 2-3 notches on my wheel at once (one by one doesn't work) to grab a single item, and sometimes it grabs two (which makes me think there might be scroll wheel acceleration shenanigans involved, if that's even a thing?)

there's no template for submitting a bug report here so I'll just give all the info I have:
Minecraft version: 1.12.2
Mod version: 2.10-mc1.12.2
Modpack: FTB university
it's on MacOS if that could impact anything, which it really shouldn't because JVM and stuff
also the mouse is logitech g903 if that helps.

That's strange. Could you send the Mouse Tweaks config file? Also is this the same with vanilla Minecraft containers too?

Here's the mousetweaks.cfg file:

RMBTweak=1
LMBTweakWithItem=1
LMBTweakWithoutItem=1
WheelTweak=1
WheelSearchOrder=1
WheelScrollDirection=1
OnTickMethodOrder=Forge, LiteLoader
ScrollHandling=0
Debug=0

And yes I first noticed this behavior with vanilla chests. Also scrolling to cycle items in toolbar works fine and it moves one item per "click" so java/minecraft are actually detecting individual steps on the mouse wheel

Could you try with only Mouse Tweaks installed and no other mods? Also could you try ScrollHandling=1 in the config?

Tried on a bare minecraft forge installation with just mouse tweaks, both with scrollhandling 0 and 1, and I restarted minecraft between config changes just in case, and the issue still persists. (I was gonna mention that ftb university has a smooth scrolling mod too but I just now proved that's not the issue so idk)

Thanks for testing, I uploaded this version to CurseForge.

Ah, I remember something like that from another macOS user. They even added a setting specifically for their mouse.

Please try this updated Mouse Tweaks, set ScrollItemScaling=1 in the config: https://bxt.rs/files/MouseTweaks-2.10.1-mc1.12.2.jar

The updated version works perfectly with ScrollItemScaling=1, thanks a lot.

Also for anyone reading this issue in the future, I believe YaLtEr was referring to #22