How do you use boarding effectively?

[Warhawx]

I find a 2 crystals + 2 mantises is a great tactic. 2 pad teleporters will get overwhelmed in later sectors. Crystals, however, makes boarding trivial as they can lock rooms down to:
-Stop enemies from coming in while you destroy the weapon system
-Seperate enemies, possibly taking them one at a time in a 4v1 situation
-Very importantly, prevents enemies from healing up at med bays.

The 2 mantis will whittle things down quickly while the 2 crystals are good at combat more than all other species except mantis (sure, rocks are tougher, but they are slower and can't lockdown)