Most buttons are assignable, you may be able to create a macro and then assign it to the scroll wheel via the mouse software.
For Windows mice try the latest Intellipoint 7.1 ...
http://www.microsoft.com/hardware/do...px?category=MK
For Logitech mice I suggest the latest Setpoint 6.00.68. Click select file to specify 32 or 64-bit OS ...
http://www.logitech.com/en-us/428/65...s&bit=&osid=14
If you have logitech, the added functionality of setpoint-uberInstall may be exactly what you need (Enable all options on all buttons) ...
http://uberoptions.net/
NOTE: UberInstall for SetPoint 6.00 in Win 7 64-bit does work, you just have to specify NO, Continue anyway and then the new locations of the files uberOptions needs to install are:
C:\Program Files\Logitech\SetPointP
C:\ProgramData\LogiShrd\SetPointP\Devices