Gandalf, this sounds great! I wouldn't recommend committing to one-a-day. Id say just do what you think is enjoyable, taking what requests and suggestions you like.
Scenarios set up with some human attention are bound to be more interesting than automatic ones, especially if you tweak upon what the automated routines come up with as a base.
I think it's interesting to choose games with certain combinations of nations present or absent, and then to add some interesting sites and independents that match them.
For instance, a map without Atlantic, Ry'leh, or Ermor, and with little of value underwater, would focus the action on land. You could also have a game with Atlantic vs. Ry'leh, and the rest of the world all independent - Atlantis needs to save the world from the horrors from beyond, but the rest of the world has to be convinced that Atlantis should save them.
Another idea is an Impossible Ermor on the far side of the map from the player, and some Easy AI's, so the player has to save the world from a quickly-growing Ermor.
Or a Nordic theme, a Mediterranean theme... etc.
Adding a few independents who are difficult to crack, but are sitting on a nice site, is nice. Placing sites appropriate to each nation can be nice too.
I dunno - there are tons of possibilities. I'll not place any requests yet though, because I've several games I have too little time to finish already.
When I start a new one, though, I'll definitely come to your site looking for a nice scenario.
PvK