Can the options on my zed be changed while theyre in there?-do they charge extra?-been quoted £40 plus vat for diagnostic check,sorry if its a daft question but on my e46 i was happy with the key as it was,whats recommended?-ive heard about the 3 flash indicator,ive read about an auto lock option is this the one that locks the doors after 5mph?-or is there an autolock option when the car is left stood unlocked for a length of time?-any must have options?-thanks