This was a good thread about building drive for objects. It's LONG but it has a lot of good information I think. You need to be exciting, the tug needs to be exciting, more exciting than other things. While you might not crate, you need to take away the toys, and maybe the other dog so that the most enjoyable play happens with YOU.
While I do not necessarily believe that you have to constantly crate/kennel a dog to bring out drive...I do think that they need to learn to "turn on" and "turn off". And I think that this is what the crate can help you to achieve. When I let my dogs out of the crate...We work. Immediately, even if it's only one or two behaviors. When they first come out of the crate they are excited and up and have more energy. Then once they have worked I free them, put up their toys, and then they can come inside and chill out in the house. What I want them to learn is that when I let them out, we work. This ties into a lot of the behaviors I expect from them at the fied. When my dog comes out of the crate at training he needs to be "On". Once they start to understand the games that we play I can ease up on the routine because what I am trying to create is a habit of behavior. If you are planning on training on say a Saturday morning, you crate Friday night and until training on Saturday? Maybe if you know you want to work with your dog when you get home form work, you ask for the dog to be crated a couple hours before you get home. I know I work with my dogs first thing in the morning when we all get up before breakfast, and then again when I get home from work, and the puppy gets extra right before bed.
I understand why people do not like isolating a dog to create false drive, however, I also think it works to an extent. When Argos was in for mouth surgery, he had a number of stitches throughout his gums. He wasn't allowed to have anything hard including toys. He had to be kenneled whenever I couldn't directly supervise him because he would pick up anything in the house to chew on, and he also was restricted to leash walks because if he was loose in the field where we ran our dogs he would grab sticks and we simply couldn't take the chance of him messing up the healing in his mouth. This dog was never really food driven, but I have to say from all the confinement he was so EAGER to do ANYTHING that I taught him all kinds of new behaviors with hot dogs, which surprised me. Also, even once he was able to work for toys again, his food drive remained higher than it was prior to the surgery. I think what happened is that I was able to "teach" him food drive and create a connection in his brain between being excited to work and the food.
So I do think to a certain extent that having a dog with some drive and not allowing them to put it anywhere else except into the work can help them to learn to channel their behaviors. However I also think that if you have a dog with a lower level of drive...you're not really going to be able to get a "drivey" dog from crating.