I know this is an old thread but I thought I would post that Intelliremote now supports customization of all X10 based remotes such as the ATI REmote Wonder and Wonder Plus.
If you want to have complete control of your remote you might want to give Intelliremote a try at
http://www.intelliremote.comYou can assign a keyboard action, mouse action, run an application, run a Windows script from any remote button you want and create profiles so you can change your remote behavior based on what application is active like ITunes or MCE 2005 etc. So if you want your remote Next button to do one thing in ITunes but something completely different in Winamp or Windows Media Center you can!
--------------------------------------------
Melloware Inc.
Take Back Control of your PC!
http://www.melloware.com
info@melloware.com
---------------------------------------------