It's not sending the call to the running application, which is "Media Center 21.exe".
It calls up a small 541Kb file called MC21.exe that resides in the Windows\System32 folder. MC21.exe is a little helper application that can receive commands that are passed to the running application (or launch it if the main program is not running). The change in location within MC is virtually instantaneous. Try it from the Windows "run" tool to see how quick it is, with little or no impact.
These would more or less be a 'set and forget' thing for you, with one caveat:
When we all move to MC22, you would need to edit the strings in you launcher to change the MC21 to MC22.
Even if I could have gotten the command to fire from the resource file, you would have still needed to add a line for each smartlist location, so in that regard, there's not much lost in terms of work involved.
Your intended use for these sounds pretty cool. I would still be tempted to have a go at separate MC21.exe calls for your dials, just to see it working while you wait and see if your request gets any love...
Go on... you know you want to