I don't think it would be as hard to freeze as all that. Sexps are pretty powerful. You can force the ships to stay in an orientation, lock all their turrets, keep them from taking any more damage, increase time compression (like for the screenshot script), or move them really far away from each other. My plan is to represent them with icons, and maybe give the player the choice to personally command one of the skirmishes or battles that would take place during the turn. It could be nice to actually freeze all objects in the engine, but it's not necessary.
The bigger point of it was for you to feel like a Petrarch or a Bosh or a Steel, managing the strategy for whole fleets, weighing losses against strategic gains, holding a system to protect civilians. I also would love for us to be able to play "what ifs" and from the opposing side without having to create a 5 mission campaign that will probably never get finished. Neo Terra victorious? Why not! Let's pretend we're Bosh for a few hours and see if we could have won as the rebellion in Epsilon Pegasi!
My less ambitious project is in a hard drive in a computer I can't currently turn on, and I'm kind of waiting for the ability to get a new computer before I try to get the data from the old and try to finish. It was actually something like 75% of the way finished, with most of the remaining work being aesthetics and polishing.
And honestly, no, I haven't written anything in the scripting language, but it looks even easier than Excel VBA, which I work with at my job, and I think I have a solid chance at being able to pull this off. It just would take some time.