or go into your starfarer folder, starfare-core, data, config,
Open settings.json in is it wordpad or notepad? (I use notepad++ so I don't know)
Find the line that says "battleSize":100, # max total of fleet points deploy for both sides in any battle, sans bonuses from objectives
Change the 100 to something higher, like 200 or 300..
Save it (make sure it's still a .json.
Play the game.
Also make sure to make backups!
Also note: this will increase the amount of ships battles contain in general, so beware when facing large fleets as you probably will get ganked by 3 onslaughts :P