EV share , would work like a xp share but with the same amount of evs the leading pokemon gets , or at least the normal amount of ev the pokemon you kill gives , because what is really painfull about xp share is all the time you gotta wait for the message to finish saying all your pokemons have gained xp when you are doing a 6 man party and also you could ev train poke while killing tangelas for xp and not giving half away to your xp shared pokemon.
OR just a xp share toggle off option on xp share , and a ev share toggle off also (since no iv calc it woud be easier to have pokes with only 0 evs to chek their ivs when you level from level 1, this is only to be easier to chek ivs )
edit: nvm this idea it would ruin amnesia brace's value , but i stilll think its a good idea if youd give amnesia brace the double triple ev value of a pokemon instead of just no xp =)