I have a Logitech MX400 Laser Mouse which has 5 buttons + 4 for vertical/horizontal scrolling. I would like it set up so instead of horizontal scrolling pressing right on the scrollwheel will send Ctrl+Tab and left will send Ctrl+Shift+Tab, which will allow me to cycle through tabs in browsers.

Also, it would be nice if I could remap the middle button to one of the ones on the side as it is really hard to press down.

Another bonus would be if I could write a script that allows me to define what buttons do what dependent on which window is currently active.

I have tried using xmodmap but I could only see how to rearrange buttons, not have them send key signals.

Thanks in advance.

Button Map (using xev):

Left        1
Middle      2
Right       3
ScrollUp    4
ScrollDown  5
ScrollLeft  6
ScrollRight 7
Backward    8
Forward     9