The Romulan Weak Squadron actually spawns Klingon ships. They appear as Birds of Prey and are flagged as Klingon ships, they will attack Romulan rather than you.
When entering a marker waypoint I have to hit the space bar to trigger the event.
And a suggestion.
Can we make optional objectives and perhaps even multiple path scenarios? I want to have the option to use terminal A or terminal B to spawn ether enemy group A or enemy group B as part of a training simulation.
On a side note, my mission has been published, so you're free to explore these glitches yourself!