I just signed up for ExpertFlyer for the first time after years of not using it. One feature that I would really like to have is the ability to get a seat alert when a currently *unoccupied* seat becomes occupied or blocked. The obvious use case is having an empty seat next to me that I am hoping will stay empty, and wanting to know if it gets filled, as I'll go pick another place to sit that has an empty seat next to it.

Does anyone know how to do this?