ili: People get stronger not only by fighting but also by walking/running.So I think it's only fair to give experience for moving in the map. (say; 1 exp/10 spots in the map moved).
if you think that's unfair,let me say that it'll take 1000 steps and 1000 stamina to lvl up by walking.

Also,some players really put their heart and soul into the game and plays for a very long time every day of s2.how about rewarding them by 1exp/min?