Other than the higher damage potential, statisticaly speaking you should never be using evasive fire as an hatred generator instead of hungering arrow.
Purely statisticaly hungering arrow with the mostly used hungering arrow rune, actualy generates more hatred per shot. For example out of 100 shots (300 hatred) 35 will pierce and hit an additional enemy (additional 105 hatred), out of which 12.25 will pierce (additional 36.75 hatred, etc. This of course goes on indefinately, however the final munber is very close to 461.54, which in turn results in an average of 4.62 hatred per shot).
However, there are other situations, not looking at the hatred generation, where evasive fire can be more preferable (placing a trap, shooting an close enemy, backfliping and getting the speed boost fron tactical advantage).
In my oppinion the only real advantages evasive fire has over hungering arrow as an primary attach is its ability to shoot through walls of the waller type mobs and the projectile hitting instantly (no prejectile travel time).
As to your other question, evasive fire reaches a bit "off the screen", very close to how far an elemental arrow travels, so yes, you can fire it without triggering the backflip if no enemies are in range.
As an addition to Oak's dilema, no, evasive fire doesn't have any damage diminishim effects in reference to range.