Right, so one of the biggest problems I have with all super hero stories is that they don't do a very good job of actually using their powers (I'm looking at you Hal Jordan). Now I understand that part of it is that comic book writers and illustrators are still trying to tell a good story, but every time I see Green Lantern make a fist with his power ring, I cringe. Could we be less imaginative? I guess the gun is an okay step up, but it still lacks imagination.
I have to confess, Green Lantern might actually be one of my very favorite comic books, but it really has some problems: unimaginative heroes. I mean really, all they would need is to make a pebble out of their will power inside the heart of a bad guy, and viola, big fight scene done.
Okay, it doesn't make a very good comic book, but seriously? I get tired of watching them slug it out with their fists when really all they need is one good solar flare to take care of all the bad guys on that one planet (no really, there's a scene where all the bad guys are on one planet, and they don't nuke the planet because they don't have the fire power). I mean really, did they forget that E=MC^2?
Then there's the last airbender. They really do it right. The benders use their powers for all kinds of things, in all kinds of ways. When I first saw water bending my first thought was that the body is almost 80% water, but I stored it away under the "this is a kid's show and they'll never go there." Then they went there with the blood benders. I was shocked. It was awesome.
So yeah, basically, it boils down to this: your characters don't need more powers, they just need to get creative with the powers they have. And if you want to see what it would be like for a firebender in the morning, just check out this video, I promise you won't be disappointed.