Can I edit pattern parameters from a Windows PC/Mac, etc?

You can't edit them directly, however, you can use the dedicated software 'SQUID Manager' to forward SQUID's patterns to Windows PC/Mac as standard MIDI files and then return them as the SQUID's patterns after editing them with DAW software, etc.

You can download the latest SQUID Manager from here.

https://www.pioneerdj.com/en/support/software/production/toraiz-squid/

NOTE:
The specifications of the SQUID and MIDI files are not the same, so the SQUID patterns after the conversion may not be able to completely reproduce the original MIDI files.