Hi,
Presently in the credentials window, each entry is displayed like this :
Website name
Username
But when you add a custom field you have to click on each entry to see them. Why not add a secondary view where you can choose to display all the custom fields & note beneath the user ? It would be like this
Website name
Username
Note (if exists)
Custom field 1 (if exists)
Custom field 2 (if exists)
etc