Whilst working on my mini the other day I came up with a solution and was quite pleased with myself.
I had changed the door checks not too long ago yet my doors still like to close themselves even on the slightest of inclines. Not wanting to always park nose downhill I fetched 2x bungee cords out of my boot and attached them as in the photo.
A quick cheap and easy way to keep your doors open when working on the inside of your car.
Anybody else got a different solution?