hmm, I would simply write that it's shooting 4 MIRVs at the same time to the description in LocData.
I have much smaller problem. "Major caliber turret" - the default name, is simply too long for the small description window, so it's written through "Turret type".
I'm finally finished with adding different kinds of major caliber turrets to different factions FTU markets, I've also modified dispersion or heavy cannons and rapid-fire cannons and plasma cannons so they are now equally strong as lasers and particle accelerators. Liger with 8x Vincinidator + 2x Basilica turrets, yay. All payed for ingame credits, no credits at the start of the game or from selling stuff I've added myself at the start of the game.
It's actually nice for gameplay, I can choose to upgrade fighters (classic SW3) or only mothership(modified Liger).
I'm going to try making rapid fire major calibers

. Could be fun if I could make it. And then I'll give it to Triada FTU markets since they don't have any major calibers now.