(Note: This is obviously a bias opinion since I love playing on Maynard but)
-Support
I don't think this has ever happened ever & this is a prime example of what NOT to do on Maynard, but if you do want to bring up that point, isn't Maynard the reason of Containment Breach?! I feel like having set rules for Maynard is just going to be unnecessary. There hasn't been set rules on the job because the whole point of the job is simple (which is to maintain cover & cause a reasonable amount of chaos in the facility, to match whatever situation is going on or is about to happen.)
Making rules like 5 minute NLR per SCP, isn't really needed since the whole point of breaching SCP's on Maynard is to cause a distraction so that Maynard can either complete his objective or assist Chaos with their raid, After all he's a High Ranking spy in the foundation, and it's already hard enough with people Meta-Gaming 24/7.
then again, that's just all my opinion