Using Policies for DST / notes.ini Changes

I am not a user of policies yet, but after reading all the articles about dealing with the DST and that policeis can be used to change the notes.ini file I am wondering one issue.

I understand I have to change the form in designer to add the fields I need changed. but can I set a new desktop policy that will only change this one / two items? i.e. I don’t want to get into setting every variable right now, can I just leave them blank and only change / set the few I need that deal with DST? Will all the other settings stay as they are already on the client?