ahh with a lot of trial and error m8, I start game in test mode, collisions and war simulator are usually switched off and just start a QB match. I start by having them all set to friendly, then set up (F2) so you select take secondary target then break target lock( set like that so ships can fire while in wide view mode...F5 and be positioned without camera moving). It also involved powering down engines and weapons(ship to ship transport) so they dont move or fire until ready. then whatever ship you want to fire or return fire you set to enemy.....it does involve being quick with the final setup or set all ships weapons to low and shields to there highest setting.
I also try to use a small ship like a shuttle as a reference point at initial setup so you have a starting point for all ships positioning
I know that all sounds complicated but like I said it is a case of trial and error and have spent hours setting up pics just for that one shot moment, Edit mode does help make things easier but there are some things it cannot do...or it does and I've not figured it out yet...lol
It is also rather disheartening when I've spent literally hours making a kick ass pic then I come out of edit mode to take pic and fudging game crashes when you press print screen.... many a few F bombs thrown at the monitor when that happens..pmsl