I thought there were plans to add some simple checks to prevent this?
1. Rogue forces cannot loot when hostile troops are present, just like everyone else. Since rogues are at war with everyone, this means that rogues cannot damage a region when other troops are present.
2. Rogue forces cannot loot if they are in the retreated, scattered, or rallying states, again, just like everyone else.
All we're asking for is that rogue forces get the same restrictions as normal troops when it comes to looting, and not treated as special cases.