Good idea but...
If you had a medium nose to tail accident that damaged the alternator and starter solenoid breaking the circuit your doors would all pop open. Which is great until the pill popping concrete truck driver does not see the acccident in front of him and dates you at 60 while your doors are open.
I think that a mini would be far safer in a big impact if the doors were closed rather than open.
I guess that this must be the case as the 'flapper' handles came to be with the introduction of 'burst proof' locks in 1971.
I can see the look that you are trying to acchieve but feel that the 'shaved door popper' look should be left to the 'trailer queen' show cars.
Timbo wrote:
It would be quite simple to wire them so that they only stay closed while the electrical system is working, that way they would just pop open following a crash.

Tim