Thanks for informing me of this first you have 3 different kinds of jetways already what it the trouble in four and also there are some of us that have very high graphic computers and this would probably not change our fps much.
The scenery was made in 2008 so, it was optimized for the computers of that time, you can't expect we'll keep updating it along with the increasing PC specs.
And, for the same reasons (FS9 was still prominent in 2008), KORD still uses a lot of legacy FS9 code, which means it's slower than 100% FSX native products like KDFW and KLAX so, we'll probably could afford new features only in case of a complete redesign, based on FSX-native methods.
All our past sceneries are under consideration for this, but we don't have any released dates right now, and JFK will surely be remade before KORD.