Advanced Analytics Using Like by Default

I have a client that is creating Populations via Advanced Analytics which he uses for role assignments. It seems that most of the time he is using the basic search, not advanced. We noticed that the GroupDefinition Filter for the populations when using the basic identity search are actually producing startsWith LIKE filters rather an EQ filters (which you think would be the default since you’re choosing one value for an identity attribute in the basic search). This may produce undesirable search results.

I know that for out of the box identity attributes, you can change the SearchInputDefinition objects to perform different search operations, but how can I change this for extended searchable attributes? They do not have SearchInputDefinitions defined.