In real life you built the ramps for a fixed target... To accomodate a game with moving targets it would be a simple compromise to allow it to turn, to reflect building different ramps for different targets.
Just have a few pointed in a few different directions but still only be able to fire just "x" number of V1s...
Ex. if u wants to hit the target Northeast and Not Northwest use the ramp pointed to the Northeast and NOT the ramp pointed to the Northwest.
However the One time one use thing is questionable. 3 ramps with 3 rockets per purchase sound a little more practical. When u have fired all three you will be booted out much like you are when u are in a manned ack and shot.
My idea in conclusion.
- The operator will be in command of the entire base (or not, depends on size of base and number of operators desired)
-Kill the rotation idea, just have several ramps pointed at several different directions.
-3 ramps with 3 rockets come with every purchase
-The operator must first choose what direction he wants to fire like he does in what direction he want to take his plane off via tower clipboard.
This idea could work in shorter ranges with different artillery types.... Even rail guns