I'm just relaying what I've experienced working on close cowled 3350s.
Yup which is indeed very interesting. How do they go about cooling them down completely when finished with them? Just let the heat soak process come to its natural conclusion or use external cooling?
I think we could choose to look at WEP this way: in the war you might have had the need occasionally to use WEP or overstress your engine to get you out of trouble. In AH if the gameplay is healthy then we should be having an emergency white knuckle situation every sortie. So I think it's not stretching the imagination too far to relax the physics a little bit regarding stress / cooling. AH does not delve into modelling reliability or complex engine management and we're all fine with that.
If you get to the rearm / refuel pad, it's logical in this context to reset your WEP too. Otherwise you'll just end sortie and get a new plane which amounts to the same without impressive 7+ kill runs in the buffer anymore.