Corsair has decent pistol skill actually! Brutality is also very nice, along with pillaging (when it’s fixed), and jolly roger. It’s a heavy recommend outside of the others.
IMO the two good BM builds are:
BM-Corsair-Enchanter
BM-Thauma-Linker
If you go BM-Linker while you can go Enchanter, it feels lacking to not have gone thauma with linker tbqh.
If you go BM-Corsair there are other third options, but basically both corsair and enchanter give you strong benefits to your class. Outlaw has some really good skills to syngergize, but not as much as I’d like personally. (You have invuln from their pistol skill and you have bully for evade, and you have Aggress to provoke mobs on you [and make them come faster], but that’s really it).
BM-Corsair-Assassin also is pretty good but Assassin’s main point it will bring you will just be Hasisas. Feels like a waste, would rather have outlaw, linker or enchanter at that point.
Also don’t stack too many class combos that give you ASpd steroids if you don’t have good ping! Instead aim for +damage steroids (Enchanter’s skills, Brutality, etc). Quicken+Hasisas will let you attack fast, but probably outpace your ping for most people or make building more ASpd simply not worth while. Find a nice balance.