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The Broncos have many needs, yes, but not at QB. Most of them come on the defense. Dumervil will be switching back to a 4-3 DE, and Robert Ayers will too. I think Dumervil will be fine, knowing how in his first 3 seasons as a Bronco, played DE and recorded 26 sacks. Ayers is a question mark though.
The Broncos, without a doubt, need a DT. BADLY. Biggest need on the 4-12 Denver Broncos, if you ask me or any other Denver fan.
We also need help from the pass rush from our defensive line, and linebackers. DJ Williams is more of a run stopper. He's ok when it comes to pass rush, but he's not excellent.
You could argue about the secondary, but even if you had Champ Bailey, Ed Reed, Eric Berry, and Nnmadi Asomugha in your secondary, and with Darrelle Revis third string CB (or vise-versa with Champ) if you didn't have a pass rush, it wouldn't be very effective.
We also need an OT with Ryan Harris possibly leaving, and they play RT for Tebow's blindside.
Don't forget the running game! Moreno's a solid back, but it wouldn't hurt to get him a good compliment.