For thread-contribution purposes, I've come to realize that the Panasonic 42px80u, once scanned, retains separate channel listings for cable and antenna scans.
To explain, once I attached the "cable" coax to the set and scanned for channels, 60+ were found with my analog cable service. I then disconnected the "cable" coax and hooked up an "antenna" coax. I then went into the menu, changed the input from "cable" to "antenna," and scanned again. This time ~15 channels were found via the "antenna" coax.
I then unplugged the "antenna" coax, plugged the "cable" coax back into the set, and switched the input to "cable" in the Panny's menu. Voila, the previously scanned 60+ channels were restored and I didn't have to rescan! The same happened when switching back to "antenna."
What this means is that a simple A/B coax switch will somewhat solve my problem, and I will no longer have to climb behind the set to switch coax inputs manually. I'll just have to throw the switch and change the input in the Panny's menu. A *small* victory, I suppose.
Now does anyone know where I can find an electronic coax switch?