Mute button for the radio....
Somebody will probably tell me that this function already exists
On our other (VAG) car a single press of the on/off/vol button mutes the radio - useful when listening to the reverse park (which seems a little quiet on the Civic imho). I know that this is achievable by turning the vol control down but the single press thingy works nicely.
And I second the electronics working for 30 seconds post, once again the Honda habit of killing all power even though the key remains in the ignition is irritating (same on an Accord btw). Leaving the windows & mirror-folding working (I think until the driver's door is opened on other makes) is a nice feature.
Did anyone mention a separate boot opener button on the key fob (cf the Accord tourer, doesn't need the fancy powered tailgate though).
But the Civic is still a great car !