At least in-game, on Lizard and Salamander (didn't check on the other Wizden servers)
Lizard set of rule specify "station wide damage" but it cover shuttle recall, mass murder (and as expected station structural and distribution damage) before the 30 minutes mark
On Salamander (it's rule 11 on this server, i don't know why), no such specification are maybe, its only "don't be a dick"
But the set of rule on the wiki forbid said activity as a whole with no time condition.
One project Manager even said this rule can be ignored after 45m.
First of all, i would like to know if Station wide damage is part of the gameplay on SS14, or is as stated on the wiki forbidden no matter the case or timer of the round.
Also does this count only for the traitors(syndicates) or also affect Nuclear operatives and Initial infected and any if not all future antags?