Examples:
How do I reward people for interacting with new players without using character advancement?
Every new player (important: player, not character) that hits the grid gets 2 'newbie points' to bestow on whoever the hell they want, be it the friend that pulled them to the game or the person that walked them through chargen. Those points can be used to buy badges for your wiki page to show off how much of a newbie helper or new player recruiter you are. Yay! People like being recognized as helpers.
How do I reward people for playing in public rather than being squirreled away in their private places all the time?
Get into the habit of dropping NPCs into public scenes and giving out plot information in them.
How do I --
And on and on. You have to start with the specific behavior you want to encourage, to find a solution for that behavior that is not character advancement.