I trawled throught the manual and fiddled for hours within the maxidot set-up menus, but I can't seem to get the car to open all doors on a single plip of the remote keyfob. Currently only the drivers door opens.

What is the menu sequence/option for a facelift O2?

I don't think it's something you can do with Maxidot.Had my car connected to the VAS and done through there .....

I trawled throught the manual and fiddled for hours within the maxidot set-up menus, but I can't seem to get the car to open all doors on a single plip of the remote keyfob. Currently only the drivers door opens.

What is the menu sequence/option for a facelift O2?

Yes it is done with Maxidot.

I think its in convenience setting

Not sure

yep

on mine it is:

convenience

door open

single.

... and you need to program both keys - they seem to work independently