Tac BOFFs can have Attack Pattern Omega . . . Sci BOFFs can have Polarize Hull . . . be cool if Engineer BOFFs had access to an anti-Tractor Beam ability, too. Maybe a proactive resistance to being Tractor Beamed (instead of the reactive resistance to T-Beams ala APO or PH).
Make it Rank 1 @ Lt Commander ... Rank 2 / 3 @ Commander
Would help fill out the somewhat thin amount of selections avaiable at Commander ranks for Engineer BOFFs