One way or another, the old system of having to come on here and declare war to attack a town will be discarded in favor of more fun and dynamic systems.
Capitols will no longer exist either way. Teams will now have planets that are linked to the hub world by portals. Under normal conditions, reds wont be able to travel to blues planet and vice versa. Gaining access to an opposing teams portal will have requirements. As for those requirements, I have two ideas in mind. They both would rely on towny and its war system. They are as follows:
1. There are 5 locations and a central location. The central location is a portal complex which features numerous portals. The portals can be directed to dial up a portal on any teams planet, allowing invasions to occur. The portals need power to work, though. The only way to get power is to accumulate it by capturing land in those 5 points. To capture land you would have to occupy it. The land has "health points" which are drained when someone from the other team stands on it for so long. After the lands "health" reaches 0, it becomes the property of the team occupying it and that team is awarded power points. Players would be able to capture land to accumulate points at any time. After a team accumulates so many power points, they can redirect the power to the portal complex and use it to open a gate to their enemies homeworld. However, the gate needs a certain amount of time to power up and can only be used during certain periods. The gate will also cease to function after its power runs down and the whole process will have to be repeated.
tl;dr - You can accumulate points by capping towns at any time but you still have to make a formal decleration to invade a homeworld, and you have to have a certain amount of points from town capping to afford to do that. The portal stays open for a certain amount of time then closes, requiring more points to be accumulated to activate again.
2. Each team (2) owns about one third of the hub map, which is divided into towny plots. The teams plots will be situated in the corners of the hub map, with their portal rooms at the very edge of the map corner so that there are numerous plots to act as a buffer between the wilds and the portal block. The team leaders can declare war at any time, thereby allowing their team to start claiming the other teams plots. To claim the plots you must place down a flag and keep it intact for a certain period of time. After the time period elapses the plot would come under the control of your team. The team would be unable to claim plots on the interior; they have to start at the plots bordering the wilds and work their way in. Once they have worked their way to the portal block they will be able to claim the plot which has the portal chamber. Once that plot is under their control they will be able to use the portal to their enemies homeworld freely, until it is taken back off them. However, to prevent that lone guy from Slovakia from beating an entire team at 5 AM with a wooden sword,
teams will not be able to claim plots unless X amount of people on the opposing team are online.
tl;dr - You have to claim territory by placing flags on it. After you claim all the territory leading up to the other teams portal block, you can capture the portal block and use it to travel to that teams homeworld. The only way that team can keep you off their homeworld is to take the portal block back. Teams have to have so many people online before territory can be claimed.
Option 1 still uses the forum decleration to a very limited extent. Option 2 does not but requires a certain number of players to be in game before you can capture plots off them. I'm in favor of option 1 due to the fact that with option 2 a weak or unlucky team could be completely dominated with no respite to build up their strength. However, option 2 doesnt involve as much gimmickery and is more like real war (capturing all the territory leading up to a nations capitol and having to take and hold that capitol with an occupation force).
Weighing in here for input and to see what you guys might prefer.