I don't think USB hubs are supported, even though this might be added in a firmware update eventually. Also it would likely require a powered hub to be practically useful, since Lich itself would provide up to 0.5 A current. This is typically sufficient for a single device, but with multiple connected it could become an issue. @mars might have something to add about this.
Regarding patch number, it shows the last digit of patch number. This means that 1, 11, 21, 31 would be shown as just "1". Also, display has nothing to do with saving patches, because it is done from a PC by sending MIDI data. You only need to look at display if you switch patches without a connection to PC.