Re: No reverse
My favourite was my Transporter allowing reverse to be selected but insisting of going forwards regardless. There's a big online forum for Transporter owners and within seconds of googling the complaint I found "...Look below the battery you'll see a ball joint... wrap a zip tie round that not too tight and you'll be sorted.. I did it as a temporary measure but it was still there 30k miles later". Sorted!
On a petrol station forecourt I've had the embarrassment of not being able to open the fuel flap on a Vito van... It turned out to be some button on the dashboard. I prefer the Renault Traffic / Vitara method - the nearside door overlaps the fuel flap, so the flap can't be opened until the can door has been. Simple, elegant, effective.