Binding Arrows in Spellbook to a hotkey?

[coffin_aoe]

just read through old threads and found this:

...

I use xbutton mouse to map my mousewheel click to /book 3 macro in hotkey 10. Thumb mouse 1 is right arrow to page forward, thumb mouse 2 is left arrow to page backwards. This lets me access pages 1 through 6 extreme quickly without moving my hand from WASD.

...

I remember, that I was trying to bind the arrows to a hotkey / button on the mouse but didn't find it in the Hotkey-Options. Granted it was a long time ago and I am not on my PC now to check.

Is this possible?