There are some DM mods, mostly in the form of out of game spreadsheet like database programs.
I don't use em myself, but have read about how folks converted EQII mods over to AoC to help get a DM track on their characters to try and decrypt how things are done in this game.
Most of the info we have on percentages, wep speeds, defense etc were all done with DM mods.
So yes they are annoying for parties, but they do help in those trying to research beneficial stats, as Funcom gives very little (if any) details about important game stats....
Esp. since we all spend 100's of hours in these damn games