Well, it applies for both GDI Warfactory and Nod Airstrip and there is no server option to disable it (although it might be disabled in non-laddered games or something). However, there was no 30 second rule in the unpatched version. Also, the 30 second rule is disabled if the buyer gets killed or buys another vehicle which happens every now and then.Personally I've only been able to steal a vehicle right out of the factory/airstrip once and that was because I shot the buyer when he ran towards the vehicle.