You can't activate your Master/Grandmaster buffs during the combat stance, so I think that Hyperjump and Hardlines should be disabled in the combat stance, as well. When you roll out, you can't be reinterlocked for 5 seconds, I believe. That's enough time to put your shield up, and run away. So why should you be able to hyperjump to get away from fighting? Yes, I know this would mean death for noobs on vector, or any server in which a low level flags and gets interlocked. but it'd stop even the high levels from interlocking, killing, and hyperjumping away, whether the opponent be the same, higher, or lesser level of you, it'd stop the 'ninja cq and run' method. I think that this could totally change pvp for the better. for 5 seconds after getting hit by any sort of attack [that's how long combat stance lasts, if I'm not mistaken] you can't hyperjump, or hardline away.
This is just my opinion, though....