I would reiterate, though, that I think that having continents half-rogue is a really suboptimal solution, as is forcing realms to be small. On Dwi, it's okay. Kinda. Not sure how I feel about it on BT yet, but it is justifiable. But on EC and Colonies? No way...
I would far rather let realms take regions that have a novel status ("demesne" in a previous feature request, or imperial, or however you want to call it), where it belongs to a realm, but doesn't count against any caps, with the tradeoff of not yielding much. No lord. Maybe knights, or not. Reduced production.
Denser realms would have an advantage, but the game would not place a hard cap that forces successful realms to stop what they are doing.