I like the idea about the external switched source, that way you can't forget and leave them on. Or, alternately, you could leave them on all the time, that way they just come on when the car is on... Where is the nearest switched source from there??
As far as an external switch, to each thier own I guess. I like to try and keep it as stock looking as possible, I kind of like the idea that it looks stock but isnt. That way you don't have to drill holes and look for a place to put the switch, etc. I don't know. I think they should have just made it that way from the factory, but that is just my opinion.... I suppose opening the box isn't for everyone, but the option is there. Just one way to do it I suppose.
Anything else?
-Kenny