ScreamingCockatoo, There are two way to change cylinder indexing. The first and the easiest is a "free spin pawl". When installed, the free spin pawl will allow the cylinder to rotate in either direction when the loading gate is open. You can either buy an aftermarket free spin pawl or you can modify the factory pawl.
The second and much more expensive option is to buy a Power Custom hammer kit. This changes the loading procedure where you open the loading gate then place the hammer at halfcock. Once the hammer is in the halfcock position, the cylinder will only rotate clockwise but it indexes where each chamber can be loaded/unloaded.