new Bongonaut (Bongoneer?) here. Just got a lovely white/silver Tdi AFT on Sunday & havent stopped grining since. Took the entire family, plus sister-in-law family out for meal yesterday; "Can we book a table?", "How many?", "A bongoful." "?"

So, I have some questions...
What's the switch on the dash below the mirror controls? Looks like an engine with wiggly lines (heat?) on. Havent investigated it properly yet, but doesnt *seem* to do anything.
Gearbox is hilarious, my first auto. Figured out how to change down with a combination of 'L' and 'hold', but is there any simple way to make it change up?
Climate control; is there any way to control the fan speed without turning on the compressor?
I would like to have the space AND the seating. Can I fit 'gull-wing' seats in place of the rear bench so I can fold away when not needed?
Alternatively; is there any reason not to remove the rear seat 'stops' so I can slide it further forward?
Radio reception is awful; is it easy to change the unit? Standard Mazda connectors?
How long do I have to find a name before I need to register it?!
Many thanks!