When thinking about stamina you have to consider it's two uses currently in game: the marathon at the beginning of a match, and your ability to sustain motion during hectic fights. One of the prime abilities of a scout on CQC maps is the ability to be nearly everywhere at once. Your stamina dictates not just your survivability but how aggressive you can be in combat. It dictates how much presence you can have on the battlefield. When you run out of stamina you are easily hunted down and killed. Most of my deaths when I'm on a roll come from when I finally run out of stamina and can no longer kite/run away from my enemy.

In these realistic applications of stamina and aggression, a scout must take breaks to refill his stamina pool. Even with a complex regulator a minmatar/gallente/caldari scout has to wait for a very long time once he runs out of stamina or he will have to choose to continue to fight with in a weakened state. A scout entering a fight with less than half a stamina bar and runs into something unexpected is probably going to die.

With a bonus to pool AND regen the realistic applications of stamina on an Amarr scout means this: With it's higher EHP and juggernaut like stamina he will be able to remain aggressive until his HP runs out. Not the other other way around like every other scout. You spend practically no time with regen (you're not supposed to be about HP regen anyway). You can remain aggressive until you 1. Run out of ammo 2. Get killed.

No scout is sprinting 100% of the time. Sometimes it feels like it but it's not. Especially if you're jumping over railings a lot. The Amarr's regen and pool size means it will practically never see it's stamina depleted in most situations.