100 AP should probably be prevented at towers, especially ones that are insanely easy to defend and block-dependent like Sardon's and DW. If you have a saint block the flag room door at Sardon's, it's ridiculous. Hardly "strategy," a monkey could come up with that idea.

You shouldn't be able to reconnect inside of a tower either, you should be warped back to the spawn point.

A member of my guild was given a warning for blocking the entrance to the tunnel at York's fort yesterday. Not lagblocking, not exploiting anything, just standing in the doorway. It's not even the only path that leads to the flag, either. I'd consider using saints to block doorways worse of an offense. Stuff like this either needs to be fixed or needs to be considered legal, there are too many gray areas and too many trivial things that can end up getting you banned.