i may get flamed for this idea but maybe you could have it so that you regain some stamina when you get the ball, not the whole bar but just enough to be usefull with all the defenders that are now sprinting your way. for those looking to make this game more realistic this would be quite realistic imo cuz i know when playing sports I do get a boost of engery when you get the ball in such games as soccer and well soccer is all i play

btw i am far from used to sprinting yet, and have yet to play a clan match with it (which is the real determening factor)but i do think the sprint adds a LOT depth, curve doesn't come close to game play options opened up. though it is a sad thing in america at least the most popular playing places for the better players are all non sprint so there isn't much of an option to try this out with better players