So, there was one more enhancement that I decided to make to the frontend before putting it back into service. While I was looking into getting the suspend function mapped to a button on my remote, I ran across this page on the MythTV wiki. While the command shown for suspending the PC didn't work for me, I did like the idea of adding an entry on the main MythTV menu for putting the computer to sleep. That way, if for whatever reason the frontend was being controlled by a keyboard or remotely, it would still be possible to put the system to sleep easily without the remote. I was able to follow the instructions pretty much as written but changing my theme for the one in the example. The only thing that was different was that I needed to make a second entry for the button icon. When the icon is highlighted the icon was supposed to stretch to fill a slightly bigger box but without this second entry there was no stretching. As a result, all of the icons shown after were offset from their tile outline by about 5-10% and it looked pretty bad. So I found the place to put the second entry (an exact copy of the first entry, just in a different spot in the code), restarted the frontend app and away I went. Everything looks great, and I have a new sleep icon.
So, now I think that I'm really ready to put the system into use. Until then, enjoy. I know I will.