Hi @unman, thanks for all of your Qubes help & contributions,
The opposite. Right now it only works for a single qubes per time, I can’t make it work for more than two qubes at the same time. But I’m fine with connecting it directly to dom0.
My /etc/qubes-rpc/policy/qubes.InputKeyboard has $anyvm $anyvm deny, so is it sufficient to just change it to sys-usb dom0 allow?