Let me know if you want me to clarify anything. I also added Appveyor+Windows wheels over the weekend.
@Detlef Sorry I was unclear, having an up-to-date pip is necessary for installing this sort of wheel in the first place, unrelated to the HID stuff.
Re: allowing changes in priority, you could also use setcap (from the libcap2-bin package if you don’t have it yet, mentioned in the docs for psychopy.core.rush) like:
sudo setcap cap_sys_nice=eip <path to python executable>
This will allow that particular python executable to modify the scheduler machinery when regular users invoke it, but note the warning about potential issues when using with the system python. Also note that psychtoolbox does a little bit more (see 99-psychtoolboxlimits.conf).