Directional Marker on Mouse Button

In Insurgency I was able to (although I don't now how) to get my thumb mouse button to tell the position of enemies on the compass. Is there a way to lay certain quick commands to custom buttons? Would be pretty helpful, can't find anything like this right now.

We still have the radial menu in sandstorm, check your bindings in game. As an aside, would like the option of using number keys for both pulling up the radial menu as well as my callouts like I do in the old game.