MATH CAMPBELL  Yeah, thanks for that. Of course, it'd be nice to critically compare your icon with mine, excepting your link goes to a dead end.

And what exactly does the icon have to do with the app anyways?

Link spammers suck.  
(Version 1.3)

COLA SHEEP  Now, icon link file is OK! Please can try again. :)

http://colasheep.googlepages.com/DockSwitcher.zip  
(Version 1.3)

MATH CAMPBELL  This will be a flaw in the Logitech drivers where I'd imagine they aren't mapping the mouse buttons properly at the time you map them. Since all this app does is change two prefs in the Dock.plist (which don't affect either Spaces, Dashboard or Expose) and then reboots the Dock (which will also restart Expose, Dashboard and Spaces), obviously the logitech drivers are't saving the mouse button mapping to the plist file, assuming that the dock hardly ever gets restarted.

Apologies for this, but there's not much I can do to stop Logitech not writing drivers properly; the app has to restart the dock to get it to reflect your changes.

Sorry.  
(Version 1.3)

MATH CAMPBELL  Yeah, I'm sorry about that. See, what this does is re-write the prefs file for the Dock. Sadly, it appears that when the dock is moved to the side, the dock ignores the "no-glass" setting and uses the 2D style dock, whether you like it or not. Sadly, I doubt there is anything we can do about that, unless you go through the Dock executable with a hex editor and delete/change the section required. Otherwise I'm afraid it's either the glass dock, or a side dock. Not both.  
(Version 1.2)