Is it possible to lock the Parted Magic screen so that others don't tamper with it while it's in the middle of long operations?
In Parted Magic 2013.08.01, right click an empty spot on Desktop and select Lock Screen
password = partedmagic
I've not seen a way to accomplish this. If you're that concerned I would just unplug the keyboard during this portion of the Parted Magic run and plug it back in when you're ready to proceed.