Thank you for your answer madscifi, that's what i thought.
I did a bit of googling last night and came to the same conclusion. If anything, the "bigger" diode should be more resilient if the polarities actually are reversed, since it can handle a bit more current and will fail later if the fuse doesn't blow quickly enough.
As a bonus I learnt to check the protection diode(s) in case a fuse blows, since they may have taken a beating. If they fail open circuit, they're no longer any good for protecting the circuit, but will seem to operate normally. If they fail short circuit, they will continue to blow fuses which is more obvious of course.
The voltage drop should be of negligable importance, since it's not in series with the supply (and even then 0,2 V extra would probably not be anything to worry about).
Regards
Andreas