A 'tag' or multiselect database parameter that would function as tags only in the context of that database, for filtering purposes.
Currently if I have a database where one property should always be one of x specific values, my options are to create a text field and type it every time, or to create another database of tags specific to that need, or sort everything into collections with that name. It would be nice to be able to create a pick-list property without having to muddy up the global context with excess databases.