Yes, on the back of the panel there is a slot to connect the antenna, but I doubt you will get good reception as most channels are satellite now..
Rear camera can be used without reverse. The reason you get a black screen is that camera gets power from the reverse light. You just need to give the camera power and it will work without reverse.
Please provide more details on the 0000 code...
I have sd card which is FAT32 and have around 20 folders, each having around 100+ songs and have not faced any issue. Please elaborate what is the issue, is it not letting you go in the folder or just not playing.
As far as maps are concerned, they are updated by PAKNAV. They do not update the maps very frequently. Once an update becomes available it should give you a blinking exclamation on the navigation screen and you will have to go to their office to get the update. This is what the guy told me.
IMO, the map does not seem outdated, atleast for RWP/ISB.