Static jeways can be replaced or not, depending if they have been modeled separately from the terminal, or not. If they have been modeled separately, they can be excluded in the same way of an animated jetway.
If they are embedded in the terminal building, they cannot be excluded, and the only option is to change the scenery itself. Yes, this CAN be done by users, using the freeware ModelConverterX utility, as explained here:
http://www.fsdreamteam.com/forum/index.php/topic,18401.msg128495.html#msg128495But this is for very advanced users, who knows what they are doing.