i like the idea of limitations and that you have to earn vehicles...
you could also find rules such as that you excludes transport vehicles or that the vehicles are placed on the map but may not be used. if it gets too lame you can start using them...
For me, the idea behind this is that you don't just get into the game and shoot around, but that there is real squad work. both, in the squad and the squads with each other. the "vip event" that we had went in that direction for me because a couple of squads began to look strategically and communicated where the vip could be and where it is definitely not.
but i also understand blizzard and tedf. and it is true that you have an insane effort in the time before and during the game. maybe you can bring it under control if you have 4-6 gameleader on the enemy side who manually take care of spawning and troop movements.
and you can make it clear in advance that these are "hardcore" events and warn the people that anyone who cant stand ghost train longer than 20 minutes should stay away ... ^^
in order to avoid confusion, squadleaders get a briefing before the game and the SLs are determined in advance. then it would be a must to be in a squad and the individual squads would have to listen to the commander (who got the control over vehicles and logistics).
but for that you would need a lot of game leaders and it shouldn't stick to one or two people.
...but thats offtopic. sorry. ...and i hope i got the time to join this event.