Wayne - Welcome back!
Glad to see you made it back safely and all went well with your two transactions (although I'm personally sad to see the Insight go...lol)
I don't post on DriveAccord, so I'll answer those questions you asked *there*, *here*
On the Navi voice activation - I did warn you about that! What I do is to back out of the TC screen (the 'back' button on the steering wheel works nicely for this, followed by a voice command to 'show map' or whatever command you wanted. What happens is that on each screen, the system is trained to focus on commands applicable to *that* screen. When you give a command outside of that screen, it tries to map it to the closest 'eligible' command. The most flexible of the screens is the Navi map screen. The least flexible tends to be...you guessed it - the trip computer.
For the future - if you accidentally give a command that resets the display, you can press the 'back' button within 1 sec and that will cancel the command. This works best when you have the 'provide voice command confirmations' (or whatever it's called) active in the Navi options setup. Otherwise, you don't hear the voice confirm the command and you just watch the command process (in this case, resetting your TC).
Cleaning the screen - get some PC monitor wipes at OfficeMax or similar. I did the other week - cost about $6 for a container of 100. Works nicely, but leaves the area a little wet - it dries in a minute or two. Use the residual for the speedo cluster, etc.
On the spoiler - it's available as an add-on accessory. Called a 'rear lip spoiler' or similar. You can get it from HandA-accessories.com or similar - I got my rear wing spoiler for the '01 coupe there, and had a dealer put it on. Matched exactly.
Now...the project for you to undertake...getting the 80mpg TC display from the hybrid incorporated into your PZEV's Navi. I'll bet it can be done through software...

While you were gone, someone's figured out how to incorporate a different 'splash' screen in the Navi, and also is working on a 'no nag' hack (a TSX owner; on Acura-TL.com)