[Suicide Junkie]

The most annoying part of the A.S. is likely the impossibility of defense against it.

Try changing the damage type of the A.S. to "only security stations".
Then, give the crew quarters, boarding parties, and bridge one point of boarding defense ability.
The Allegiance subverter can then be renamed to "Mental Shredder" or somesuch.

When hit by this mental shredder, shields WILL protect you. Once defenses are down, all living creatures on your ship will be killed, leaving your ship open to boarding, but not pre-captured.