Mapping charms / multitask menu to mouse buttons?

Hey guys. Just installed Windows 8 yesterday and so far am enjoying it. Trying to figure everything out, but otherwise it's going great.

One thing that is bugging me though is the charms menu. I am on a multi-monitor system and hitting the charms menu on the main screen is kind of awkward and I just don't really feel like I'm hitting it 100% of the time when I want. I have a Razer mouse with two extra buttons. Is it possible in Windows 8 to map the charms menu or that multitask menu that appears on the left side of the screen to these buttons?

Thanks.