- Preventing people from starting toxins or getting TTVs is metagaming, since it would imply you know that toxins is pretty much only used by antags.
- Restricting TTVs limits the damage but you only really need one to deal shuttle-level chaos, especially if you break hard-to-replace machinery.
- Preventing people from leaving with a TTV from the lab implies that someone is watching both the entrance and the maint 24/7, which isn't realistic.
To prevent this i'd elevate the restriction level on bombs to something that must be approved from the RD before starting. I'd compare it to a dangerous engineering project or adding a law to an AI: entirely possible, but you have to get the Head's permission, or you're doing it clandestinely and can be stopped without repercussion if you're found out.
Before you go "I ded", i haven't logged on for about a week now, it's just something that has been bugging me for a while