Don't you get killed for standing in a door? The Rep lost and all that.
It used to be that you'd get warned several times, then you'd get shot. This was apparently removed (it's pretty easy to block a new player in the brahmin pen and get them shot otherwise, I used to do it all the time). More often than not though, new players would stand in doorways on the bad hex totally oblivious and do it to themselves. I haven't checked to see if your rep can get low enough from that to be shot.
This topic has been beaten to death for years. Common activities to piss off other players included town bursting, suicide bombing, stealing, and all other manner of fuckery that could be imagined. At one point some extremely bored individuals figured out where to stand in NCR, and when to shoot, and be able to escape to world map without being killed. To make it more interesting, this would occur with a Gauss pistol... anything to make players rage (again, I know something about this). While it removes some charm from the game for some people, those people are few in number, and the changes are better for the server as a whole. It's the truth, and how it is now, whether I like it or not. If the worst we'll see is some guy standing in a doorway until he tires of it, consider yourselves fortunate.
Things change.
But yes, suicide bombing is possible, just not in Hub or Barter Grounds. If you really want to do it, put the time in and catch someone in another town.