You can keep the key in your pocket in all V40s.
Not true...at least in UK, I have a D2 RDesign and I have to put the key in the slot to start, I can remove the key after, but I don't.
To get round the rattle of other keys, I carry the v40 key separate to my other keys, only a very minor irritation compared to rattling on the dashboard.
On the original topic, I LOVE the V40 interior, it was one of reasonsi chose the car over others, I didn't originally like the central dashboard with its many buttons, but after driving it for a while I really appreciate the simplicity of it.
The only downside i can think of is the dip light indication, there is more than enough space to put the green dip light symbol in the beautiful LCD dash, but for some reason it's on the light switch panel on the lower half of the dash....strange? I have developed the 'dip dip' where I choose an opportune moment and dip my head to the right and down to check if I'm on DRL or Dip lights... Not exactly safe