It's not control
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 :)
For sites, I recommend www.dicesetter.com
Start with the articles by Mad Professor in the "Mad Professor Speaks!
SW did write a book on it, which I'm in no position to critique, because I haven't read it