1st and main problem - How to be sure if the result is done on air/water if you have some awesome results? There would always be people who will do some result on DICE/SS and if it's not so good, they'll check "air/water" on the submission and what's the point of EOL then?
You can do best for the community but community will always find some hole in rules and try to gain from it.
Don't think that I don't like the idea, I was thinking of it too but there would be more problems with it than gains.