Rochelle speed running the Bridge wasn't the issue, she wasn't speed running with the TEAM. There are no hero's in Verses, there is the team, whether you are playing infected for survivors. As infected, you can play it a little looser, but the survivors must have a plan and must be in agreement. If she had simply taken "point" and made the team move faster by setting the pace while staying with the team, there isn't a problem. One person speed running like that is enough to get them kicked for tanking a game no matter how "heroic" their run might have been.
On the bridge it really doesn't matter too much what speed you're moving at as long as you're moving as a team. If the entire team can speed run it, more power to you. You have to balance out speed with mistakes, faster you move, more mistakes you make, harder it is to cover each other and more distance someone has to recover when someone needs a hand.
The only time I expect someone to speed run by themselves is when the rest of the team is L4D. Otherwise it's just greifing.