Of course there are special rules for Jeb. He is the GOP Establishment’s Designated Loser and he can’t be stopped from accomplishing his mission.
Anyone can request an extension. They are usually granted. These guys have complex financial dealings and if caught misinforming by omission or error it could sink their bid.
Nothing special here for Bush, but he shouldn’t bother wasting his time. He is not going to be the next US president.