Stopping on the runway with ENG FAIL does present a "gotcha" depending upon PTU inhibition logic. Once the aircraft PRK BRK is set, the PTU operation is inhibited which in the case of ENG1 fail and NWS on the GREEN system will result in NW STEER appearing in the INOP SYS on the STS page. However, as soon as the PRK BRK is released the PTU becomes active and the YELLOW system pressurises the GREEN system and, hey presto, you've got you NWS back
(assuming no loss of fluid)
So, it is perfectly possible to vacate the runway - after the fire services have had a good look for leaks/fire/damage/hot brakes etc. It would be quite embarrassing to request a tug due no NWS......only to watch it reappear as soon as you release the PRK BRK (with No2 running).
I think this little gotcha is being addressed with the newer PTU logic.