2. The seat is set to move to one of the preset buttons. The dealer will/should correct it for you.

If you have time, you should be able to figure it out. There is some combination of holding either the unlock or lock button on the keyfob while pushing the number you want the key to operate.

Try it, if it doesn't work i'll take a look on my car...

4. Yes it can, there are many threads here on the software which can be upgraded to the latest version depending on what navigation computer you have.