After taking a quick look at the rule book I see that Brace for Impact is mentioned in the blue book on page 35 where is disallows teleport attacks but I can't find a reference for it prohibiting boarding actions.
I agree it does sound a bit inconsistent as the book describes boarding actions as sending troops over via "teleporters, shuttles, life pods, and in pressure suits" (pg34) but that may be just a bit of artistic license.
Your opponent would get the +1 for special orders though.
Cheers,
LDTM