Yeah, I'm sure there are at least a few Starfleet regulations about an Ensign (or any officer for that matter) being alone on the bridge when the ship is on active duty, especially when it's in enemy territory. In fact, we saw a number of times that the Enterprise had at least a crew of 4-5 people on the bridge at all times, with the exception of a few emergency situations (like where Q took everybody but Picard off the bridge and froze the rest of the ship and where they were hitting the quantum filaments and some of the bridge watch officers died and the turbolifts weren't working.)
It never entered my mind that you would have an Ensign alone on the bridge, I don't even know how anybody else came up with that scenario. (I'd stop watching your movie if you did something that boneheaded.
) Thus far, you've done an excellent job of portraying Starfleet as they did on the shows and that's something they'd have never done on the shows.
