May we know why you want it that complicated? You first have to evoke Dashboard to switch Spaces, which if you find a solution fo doing so, will close (Dashboard) again before the switch completes.
Aren't hot corners or even the Spaces icon in the dock
simpler to click?
Applications > Utilities > Spaces
I am using a Mac Mini as a carputer. In other words, Im running a front end app made for the 7" touchscreen that I use instead of a mouse/keyboard.
Now, since there isnt any decent any GPS solution for OSX, I opted for iGuidance under VMWARE Fusion 3 running inside XP SP3. Id like to isolate the front end music app from the GPS app by using spaces. And when I want to see GPS switch spaces.