Ability to filter filenames and autofill data entries

I am a new user. Compliments on a great client. Two questions/ideas:
Is it possible to filter filenames based on keywords so that we can update tags more easily for multiple files? Also, as we type in new tag information, is there a possibility to add an auto-fill feature?

Press F1 and see the help on filters:

If you have certain entries that you use frequently, create an action of the type "Format value" for that field.
Or could you specify what you mean by