My guess is it would need to function something like how conventional artillery would: Not directly player controlled, but can be called in on a specific target. Only significantly less effective.
I'm not sure the V-1 had a such a devastating fire power that it could be able to take down an aces high town with just 4 V-1's.
If it were added I would suggest it show up on radar as soon as launched.
Coming to an offline mission in your town soon