Again, I'd like to suggest the idea of having a piece of equipment like an ID, except this would be separate, call it a "Command Authorization" or something. You must mount this equipment to use the /attack feature, and a stack of these items would be given to faction leaders. From there, the faction leaders can distribute them as they see fit, which adds accountability to both having and using these things. Too much abuse? Fine the item from the player. Too much abuse in a faction? Remove all the items from the faction leader's inventory, and the members.
The thing with the Guard IDs is a step in the right direction, but the fact remains that a player can get a Guard ID all by themselves. By having this special item, it requires oversight and authorization from higher authorities to use this command, both of which will severely cut down on abuse.
