Well, as any other player, after reading the word "DM", I get excited.
At first, I liked the idea, but after thinking about it, I started having some good amount of doubts about it.
First of all, to increase the "legal" DM, the wars between DE and CLO & SAP could be more frequent, as in this way, the criminals and the cops can decide which side they'd like to support, thus, they'll be able to DM.
As for what has been suggested, well, in my opinion, it could be abused in a really easy way. For example, I'm getting chased by cops, I manage to somewhat escape, but a sI perfectly know that they will come again, I can teleport in the GT for example, as there, a few buddies could wait for me there, so they can easily help me taking down the cops.
So, without the need of some additional scripting, we can work on more efrequent war conflicts where, as I stated, the players can choose a side, wear some tags and fight.
There are a lot places to fight in, that are far away from the big cities, so the partipicants in the wars won't disturb the players that wouldn't like to get involved. Whestone & MC, Bone County, Tierra Robada, Red County... once again, there are some great places to fight in.