Would you support animations for their jetways, even though you said you would only support your own?
Well, we could help Flightbeam animate their jetways, but it's not really something we have to "support", they'll have to include them within their scenery anyway.
We could simply replace their jetways with our own models, using the textures that are already installed in KSFO, and create an exclude AFCAD ourselves to exclude their jetways, just like AES does, but it's not the correct way of doing things: if Flightbeam wanted to change something in his own AFCAD related to jetways positions, we would need to change the excluding one too, just like AES (when we released Zurich 2.0, we moved many things around, and this break AES for it).
The right way of doing this, is to have the original scenery developer making proper FSX jetways on his own.
WHEN we'll have our own jetways system, it would be different, and likely talking with developers might be required.