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With the touchpad is very difficult to do gestures pressing a button and doing movements in a touchpad.

I love browsing with Opera or Firefox with the plugin mouse-gestures
(http://www.mousegestures.org/). It's very fast. Mainly I use the gesture
"Back" and "Forward" with the left and right mouse buttons.

Back: hold the right button and I click the left button.
Forward: hold the left button and then I click the right button.

I think this method could be great in others applications of kde, for example
in konqueror, dolphin, etc.