I don't have any of the manuals right here in front of me, but Ruger PLAINLY states that "Fanning" a single-action revolver is hard on the internals, and NOT recommended.
I have heard of the "Slip-Gun" method of shooting, but again, not gonna try it.
Standard Disclaimer next....Information presented below is for educational purposes ONLY. NOT RECOMMENDED OR ENDORSED
Some of the revolvers way back were converted to "Slip-Guns" by grinding down the hammmer spur, and removing some parts of the action, so that the hammer did NOT lock back, and it was fired by sort of 'wiping' the hammer back with a thumb. (As previously stated by Mr. March)
Do I recommend that, or have I tried those mods with any of my SA guns???
NO! NOT NOW, NOT EVER.