/effect @p/r/a/e minecraft:fireworks_boost [affects duration of effect] [affects speed of effect, 1=normal elytra level flight speed, 255=SUPERCRAZYFAST]
This one is fairly self-explanatory. It adds a status effect to the specified target giving it the boost caused by using a firework with elytra on. Obviously, this would have little to no effect on entities without elytra on.
Personally, I really need this, and I'm sure there are plenty of mapmakers out there who agree. Dogfights, flying adventures, even sub-marine applications.
Seems kind of random, but something I could support anyway.
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Yeah, that guy in the avatar is me. I'm *that* strange. It happens. Sometimes people act like that. Just go with it. I can offer help with suggestions even before you post them - NOT make your suggestions - but help you with them.