Righteo as I'm making the map as I type I thought I would go into the RPing element more as, at the moment it might just seem like a 3rd person playing of the game. I envision something akin to the following.
The beginning starts with a ship landing on the shores of a new land with a contingent of people or the survivors of a tribe/collection of people and races after vicious attack by surrounding nation/tribes etc. From here, with the shattered remnants of your people, it is your job to rebuild your nation and forge your own History.
Yours is a collection of races and people's; Humans, Elves, Vampies, Lizardman, Ogres, even a Werepanda if you want to (Seriously, I've got a load to play with at the moment so if you want something outside the 'normal fantasy' of Humans, Elves etc. its very open at the moment.) Depending on what you are you might therefore get special troops or something akin to that,so if you're a necromancer, upon killing troops you get a chance of a skeleton/zombie. Then each further death, by the zombie or the necromancer, has a chance of producing another. Later on when you potentially get a city/keep/whatever, you might be able to produce other units then.
Of course if you want to be a normal human or something it doesn't limit you to no troops or nothing cool. You may take ships and discover an island fill of walking talking lizards. Initially hostile you make war with them, killing their warriors that resist and taking their villages. Eventually they surrender to you and thus you have the making of an army. Although it may pay to watch them for the years to come on.
In fact the possibilities are all there. The basics are this is I will create the world, the people in it and their background. Some will be small nations, other's will be large ones, having been there for hundreds of years. The basic story will also be mapped out; in fact if you, the players, decided to do nothing but sit there, the story would play out as planned. The impact, and the changing tales would come from your influence. The doomsday plot by one mad-man might be stopped by your people. Or maybe you wish for your plan to go along.
Discussion and talk between nations would be decided by RPing of course. In fact really the only thing that would be decided would be the battles; that would be decided in game, along with the building of armies etc. The movement would be decided via RP and then shown on the map. In fact the game is mainly there to bring the choice to life. Each action would be recorded, the information passed along and posts written up.
For example, in a war the armies clash. Ten units die from your side (say representing 400 men per unit) while 18 die from their side. This would be sent to the player and a post could be written up from your side. I would also write one from the NPCs side. So in a sense the action is merely a basic representation of the bigger story. It allows a slightly more random, but also organised, element to wars and whatnot. Also game mechanics could be ignored for parts; while in game if you kill one unit then you declare war on the entire AI. However, if its an isolated scouting force, it could easily be done so the units die but if not unit makes it back then no one knows what is happening or how they died
However if the players just wish to do nothing major, such as merely RP the determination of their nation, interaction etc. then that's fine. Armies could be built but nothing major would happen until the time either the player wish their characters to or the story progresses so. This allows players to interact when they don't wish anything major to happen but also people to leave for a bit but other PCs to still do what they wish.
So, to sum up, most of the game would be done by RP. The movement of armies, the interaction between nations and players, all done in the 'normal' forum RP form. Even the battles would be wrote up like that, just the outcomes decided by the game. The results would be PMd to the player and then the posts put up. If quick enough it could even go before the next round up.
So there's some more explanation. Later on I'll put up more detailed ideas and workings but hopefully that's enough to get people more interested.