I have a suggestion to make PvP more interesting for those of us who don't like to be in big groups all the time and do solo or small-group PvP throughout Cyrodiil.
I would like to see more small settlements that you can capture scattered throughout the map.
For example, put some watchtowers, small camps or mini-forts on the map that you can capture. The NPCs defending them shouldn't be plentiful so that two players can decently capture it and even one player by trying hard and playing well. One/two guards and three to five worker npc's would be fine.
Capping this resources shouldn't be related to any keep, but you could have a small bonus for holding them (a few extra AP, a short minor buff, a small chance for finding cool loot and/or maybe the ability to have five people spawn there every three-five minutes or something).
Overall, I think this would fill up the vast landscape of cyrodiil without distracting from the main goal (sieging keeps), would give the solo-ers out there some capping fun and also give players the opportunity to spawn closer to where they want to be every now and then (there should really be a time and spawn limit on it though, else people will just mass-spawn there with big groups to get an advantage, which would make them to much of a hotspot, also don't give it too big rewards, it should just be a fun touch along the way).
I don't know how hard it would be for the servers to track and manage scores if there are a lot more of these smaller mini-resources that are under different Alliance control, but I think it would be a very nice addition to the now still somewhat empty and vast area of Cyrodiil.