filter-only Support and including password-fields

Hi Matthew,

thank you for the effort putting together this nice plugin. In our project we use it. But I came across two little details you changed during the recent development:

1. please consider putting back the filter capability for text AND password-fields. This a feature you recently removed in 1.5.4. If not directly, can you think of an extra flag enabling this feature?
2. I believe from 1.4 to 1.5 you dropped the possibility to filter only. This was one of our main arguments using your plugin. We could use the same plugin to whether filter or autotab or even both.

In this merge request I added both features. Feel free to consider your own implementation.

thanks again.