Re: I need clicker advice!
There are probably lots of different answers to this, so hopefully you'll be able to pick one that suits you. This is my take on it:
Two ball is a great way to drain energy and teach the out, also to play fun games to build quick responses to commands like sit and platz. If he has that much drive for the ball, I'm not sure you even need the clicker to fix this...
If two ball is normally the only fetch/play game you play with him, he has never learned that he has to come to you to continue the game, he has just had to come somewhat close and drop the toy he has. I would use a ball on a string or a tug (only one for now) so that you have something to hold onto when pulling him into you. Also, when you can reach out and grab the string then you can play some tug in between throws, reinforcing that YOU are the center of the game. It's okay to use a long line at first to guide him in, I think he'll catch on pretty quickly and you won't need it very long.
If he's very high octane and crazy, jumping at you and whatnot, then I would first incorporated some obedience into the two ball before you try to go to one. After he drops one toy, tease him with the one you are about to throw and then ask for a sit or down. As soon as his butt/elbows hit the ground, throw. Same process applies once you move to one toy.
If he continues the keep-away game, don't just ignore him, leave him! Go inside without him, game over. He'll soon decide that playing by your rules is more appealing than being by himself.