Your explanation of the kill switch scenario makes sense. The DCT bike should be able to bump start itself as long as the gear and clutch remain engaged.No way to coast without engine braking. I've not missed it [coasting w/o engine braking, never really thought about it] but I did invest $20 in a GoCruise manual throttle lock so it is possible to remove the right hand and hold a set speed.
If I recall correctly if you accidentally hit the kill switch you flip it back ON and the engine picks back up. No need to engage the electric starter. There is sufficient drag through the gearbox to turn over the engine and maintain oil pressure because the gear box will downshift as the bike coasts to a stop.