The chance for trolling to be successful is diminishing with every new switch, but for every switch added it's diminishing less. 1 switch = 100%, 2 switches = 50% (chance reduced by 50%), 3 switches = 33% (chance reduced by 17%), 4 switches = 25% (chance reduced by 8%). So by adding one more switch, the chance would be reduced the most, with every new switch the reduction would be less. By adding one more switch the problem would be solved. Remeber that trolls have to also be first on the switch, and with 2 switches the chance of them succeeding (if there really are two trolls) would be really low. How much chance there really is that there are two trolls on the server who want to block the doors, and that those two trolls are always the first ones to arrive at the switch and block the door successfully? It's almost non-existant. Remember that it also depends on the position they spawn who will be first to the doors, so that is one more factor. They have to spawn the closest to the elevators, and that chance to spawn in a good or bad position reduces their chance to succeed even more. The area around the switch in which players have to stand to use the switch can also be increased to allow two people to hack the switch at the same time. Then, with two switches, there can be even up to four people hacking the switch at the same time.