Logging Escalation events

I don´t have a solution, but I am interested in the use case. As far as I remember there is a property that marks escalated Activities. It´s possible to search for these escalated Activites. It might be possible to add a Method to this property. Or use a Method called by InnovatorService that searches for escalated Activities on a regular basis. I assume using the InnovatorService might be the better variant, as we don´t have to change possible core items.