Fitzgerald's in downtown Vegas used to give out matchplay coupons for craps, blackjack and roulette. You could only claim one of each per 24-hour period, but I don't really want to play roulette more than once a day anyway. They gave the player a small advantage if you used the coupon and didn't play for too long.
It's influence, there is still a degree of randomness involved. It can be done, but there is a physical element involved, unlike counting which is almost entirely mental.
The basic premise is that you reduce (not eliminate) the appearance of the seven to gain an edge. I think that with practice it's entirely possible to gain a larger advantage than with counting, but I don't have numbers for you.
One thing to consider is the remarkable lack of heat as compared to counting. I once had approx. 40 rolls w/o a 5 or 9 (due to how I bet, I lay the 5 and 9 and attempt to 7 out) while one of the dealers had a conversation with another player about how dice influence was total BS... and that's fine with me :)
Just like everything else, it has it's ups and downs. I can honestly say that lifetime, I am ahead at the craps tables... not by much, but considering the number of hours spent (easily 1000+), I know I have an advantage.
I am confident in my ability to demonstrate over a statistically significant number of throws, that I can change the outcome a significant amount.