Rolando,
The joystick was not part of the 4-in-1 package, and it does have two buttons, both are wired together now, but you could control a 4th function with the second button.
I believe I read the same thread you're referring to about the regenerative "issue". With mine, you move the joystick all the way to the right with the button pushed, past the indent, to open the bucket. To close, go the left with the button pushed. It takes some time to get used to it to avoid "erratic" behaviour.
Originally it was plumbed to operate in reverse (right close, left open), with this set-up you had to go past the indent to apply full closing force, which I found awkward. However, this configuration provided smoother operation.
I never did understand why that particular poster was forced to use the up/down motion to control his 3rd function. I don't know what affect that would have on his float position?