3. I'm pretty sure those are coding options but not 100% sure. I've never used them since I don't want my headlights on.
Door modules are boxes in door that control door operation. The 2005.5 had a highline model, 2006 had midline. To make the auto-lowering side mirror work you need a highline door module and memory seats.
Should have fold flat front seat. I actually do use it all the time as a table.
Don't know about footwell lighting but I know it's adjustable through VCDS.