Yes, you can have controlled burns for large sections. Yes, buring a big section is much more complicated than a smaller section, but it's not impossible.

I generally prefer to burn my CRP, but it depends on how much moisture we get during the burning season, and how thick the weed population is during the previous growing season.

If it's too dry, we're not allowed to burn. If the weeds are getting higly populated, then I'll make an effort to burn no matter what.