So something I've seen experimented with in other Organized Play campaigns is the concept of interstitial adventures . . . something that would allow players to play their PCs between "official" modules.
The way I have seen this executed in the past is basically summed up as:
• The GM creates small, inconsequential campaign element to run games in, and gets campaign approval for it.
• The GM is then allowed to run games in his or her setting, but only to give out minimal rewards (50xp + 10gp for example).
• Players are limited to receiving such rewards once per month, or somesuch, but can play as many of these adventures as they like.
The idea here would be to give players the chance to roleplay, develop their characters, and establish friendships and backstories in a familiar setting. Such a thing would also (on a more personal note) allow me to run new Pathfinder material at my local game store as often as I like ;).
It would be very cool to see such a program built into the Pathfinder Society from the get-go.
Xendrik Expeditions experimented with a similar concept with its "DM's Mark" adventures. I never really got to play or run one of those, but (as I understand it) they allowed GMs to make up whatever kinds of adventures they liked, providing they followed a specific reward structure. This also seems like a cool idea for empowering local GMs to develop stories around their preferred play styles, and around the characters in their communities . . and that just seems cool :).
While a very interesting idea, this wouldn't fit with our current plan for Pathfinder Society. We'll have more details soon.