Interesting idea of introducing the Dino Thunder characters.
For me personally, one thing I really want to see in a potential sequel is a terrifying Lord Zedd. He scared the crap out of me when he was first introduced to the show when I was a child. It's only fitting that he's that scary now. Also, I'd really like to see some more of Zordon and Rita's history as rangers themselves. And just how Rita was tempted to cross over to the dark side.
And obviously Tommy to be the ultimate badass. And I would agree, start off with him or her as a bully; that would definitely make for a more interesting transition after breaking free from Rita.