If you go back to his Nets days, you'd find that a lot of what he excelled at, at least when they were at their best, involved the Princeton offense and getting out on the break.
There's no reason, given time, that this motion offense couldn't give him a lot of the same backdoor cuts and duck-ins in the half court with Tim playing at the high post. And the defensive rebounding is there to ignite the break, if they'd just emphasize it and have Tony and others realize that advancing the ball via the pass results in a better break most of the time; get that outlet to the wing, asap.
Plays where RJ uses Tim to rub his man off and receive the pass for a shot behind the screen, he's actually pretty good at. Hitting him in stride off a curl going to the basket is also something they should be looking to do more of; one of his biggest assets is his ability to get to the line, but you negate that ability to a large degree when you're playing half court basketball with Tony and Tim, rightly, dominating the ball.
By the time RJ gets the ball from Tony, the paints already been penetrated and the defense is sagging in the paint. You throw the attention that Duncan receives into the equation, and RJ's looking at a wall of defenders in the way of his penetration.
The offense has been made to run the way it does because of Tony's unique skill set. If you've got Tony and Tim living in the paint, seems to reason that the natural compliments would be floor-spacers.
A lineup like: Hill, Bogans, Jefferson, Bonner, and Duncan could probably feature RJ successfully a little more.
It doesn't have to be that exact lineup necessarily, but I like the spacing you get in both the back and front court and the potential interior passing from Tim and RJ; I've seen some promising glimpses from the two.
My two-cents..