DE has implemented a "Civic Spaces" aura around the CC which reduces grain gathering by 50%. 

Well that's kind of what I was talking about, I don't think we (me personally with my limited experience) could make that possible.  But it could still be to your advantage because you aren't getting attack.

But let's say someone has a shield, the shield doesn't help them in the back, they would have to turn around. But then, not everyone has shield. Maybe people with a shield have -1 resistance from the back?

Thanks for your replies! Every open Issue has a Milestone now, the ones formerly without one got backlogged. In the next step, all Issues with Milestone "Backlog" and the priority label "1: Release Blocker" have been set to Milestone "Release 29". Right now, I have set all backlogged Issues that have the priority label "2: Must have" to Milestone "Release 29". For me, this case is now closed.

Right now the vassals produce units too fast for testing purposes, it's good they were able to do that though even if they are too powerful right now, it shows their basic combat AI is working. As for them having their own economy and Territory, that's interesting concepts that I will play round with, maybe have them send tribute in the form of a caravan to your town centre? I think the next step at the moment is having the vassals spawn as different civs with different bonuses, one could build more villagers, one could build siege equipment and so on. Having them spawn as mini unique civs as lopess said would be a very cool idea, and opens up more strategies down the line, it's definitely something I'll look into once I get a basis up for having different civs as vassals.