MainzMan:
I can't really see any advantage to a controller over a mouse. The controls here are very basic, there really isn't any need for a more complicated input device.
I used to hit the right button a lot when I clicked using my mouse, because my middle finger wanted to click, too. An old reflex from playing a lot of golf on Playstation using a Namco controller. And I hated having the context menu come up and block my view of the shot.
I also feel I click more accurately with a bigger button that I can get a couple of fingers on.
And it's nice to be able to separate out clicking and movement. With Xpadder, I can program click and hold, so I can aim and set the power with the joystick and/or buttons I've programmed for directional movement, then I can click without accidentally changing anything with minor mouse movements.
And I can still use the mouse, or more accurately, my pen and pad, since I don't need the mouse to play WGT anymore, when it's more convenient. And, as a bonus for me, it's easier to draw a putting line with my pen than it was with the mouse.