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Yes ive heard of some of these issues on older versions of MacOS. I was not quite sure how many people were still using these versions but if you need to run 32bit apps it makes sense. At the moment i only have a install of Big Sur on my laptop which has the Alps T4 touchpad and not the U1 so it is a bit hard to debug for compatibility. If i have some spare time i will try to install an older version of macOS and see if can replicate some of the issues. Not quite sure why the touchpad doesnt work using AlpsHID and does work using AlpsT4USB as the AlpsHID should be a more updated version of the AlpsT4USB. Which version of the voodooI2CHID have you tried? Do you perhaps have a IOReg file when using alpsHID?