First of all: welcome to the forums.
Second: Download and read Ed's excellent Axis/Vegas manual:
http://www.thorforums.com/forums/f10...nual-4961.html
Now third:
Can't answer the stove question (ours doesn't require a battery, just turn the igniter knob but our unit is 4 years older than yours)
For the TV: HDMI connector in the cabinet above the sink only goes to the TV above the door--as far as I know there isn't a "broadcast" feature that sends DVD video to all TVs
Yes cab radio and cameras need the use/store switch on use (or just "on").