I've done tons of focus work with Keefer, so that's not a problem. He'll also release toys on cue - I started trading games with him when he was a tiny puppy. But he's still not that careful with his mouth (at 2-1/2!), and although I can get him to take treats gently (when I remind him) when we're stationary, once you add movement he gets excited and grabby. And he's ALWAYS excited and grabby with toys, he's just not good about paying attention to where the toy ends and my hand begins.
I ordered a better tug toy from Working Dogs Outfitter that has a handle on each end, so when I get it I can try working with him on that. He's a pretty drivey guy, and loves toys, so I don't need to worry about building drive for the tug. Dena is a ball fanatic, but couldn't care less about tugging. If I show Keefer a tug toy he leaps up into the air to get at it. Our trainer was working with him last weekend on a new exercise, turning him on and off by putting him into a fast down, immediately releasing him and getting him worked up and back into a down again, over and over. He get SO excited that he started jumping up and down and biting at her sleeve. She laughed and suggested maybe not getting him QUITE so excited, lol! I may have forgotten to mention that it doesn't take much to get him all worked up....