I'd like to be able to apply a "live filter" to the All Fields list in the Properties Pane.  It would provide a quick way of finding fields that I want to assign to the current item.

 

I notice that the Field Properties window (Tools > Manage Fields) can already be filtered by field name, by clicking on the tiny underscore at the right of the "name" header.  Wildcards are supported in this filtering, but the filtering is not live, i.e. you have to press Enter to see the fields that meet the field name filter.