My idea to improve inferno is to get mounts like in world of warcraft. this would give us ability to walk 100% faster and on mount you can attack other stuff with such as diablo. The best model to use as mount would be protodrake mount or horse from stormwind. In wrath of the lich king you can attack with horse and stick to kill Death knights in front of wrathgate.
I cant outrun some mobs like the zombies in act 1 on my mage but then sometimes I crit and am lucky it dies. also make bosses easier on inferno and make mounts during fights possible. I was also thinking to enable flying mounts so we can fly to other act faster or skip mobs we dont really need. it is just example on how to make inferno easier without changing much.
mount in diablo gives great oppurtunity so we can fly to heaven and stop diablo or diablo comes down to the earth to tristram again on rare event and he can drop the special mount .
This is just my 10 cents and I think blizzard should implement this idea to make inferno better.