Yes, there was a switch on the bars originally. Mine's hotwired on, as I kept getting gunk in it so it wouldn't stay on when I wanted it. Someone took my bike for a testride, dumped it & broke the switch so took the opportunity to leave off the switch.
Do a search on bulbs - they're something ridiculous like $20 for a stock one & a thread has been done on replacements.
The bag I find handy for putting my camera in - saves me putting it on my back. I tried putting some coins & smokes in there on the weekend, but the coins smashed up the smokes - ah well, no matter, I had others ;)
Tail lights are commonly taken off - mine just doesn't work. The bag can be a pain for getting on & off the bike, especially when full, plus it's not exactly waterproof.