if $CONF['show_password'] == "YES" then show admin's password too
PS: there is extension for FF "Unhide Passwords" so passwords will be in "****" form until you clicked on password field
This is not what $CONF[show_password] was made for ;-)
// Show Password
// Always show password after adding a mailbox or admin.
// If you want to always see what password was set set this to 'YES'.
$CONF['show_password'] = 'NO';
Your patch would include the password in the edit-admin form, visually obscured as '*******' - but it would be available in clear text if someone uses "view source" or (bigger risk) reads your browser cache.
In other words: It would make PostfixAdmin insecure!
Therefore I'm rejecting this patch.
If you really want this feature (IMHO it's a mis-feature), you'll have to apply to the patch to your installation of PostfixAdmin yourself.