Listing Package by User? or for Admin only?

Is there a clever or non-clever way to have a listing package that functions in the admin interface only?

My requirement/need:

I use my own site to list ads for me personally.
I want to be able to add new classifieds from inside the admin interface, that live forever, or until I mark then inactive.
However, I do not want them to try to bill me, or flip me to paypal.

::Possible solution I see::
I see one possibility is to create a listing package that allows a free posting forever, but I of course do not want that available for the general public.
So, can I filter listing packages by user in any way?

Or, does entering a new ad from the "admin" interface automatically bypass billing?

1. Add an account type like admin_type and uncheck all boxes at 'options' section like below screenshot.

http://forum.flynax.com/attachment.p...tid=2569&stc=1

2. Add a listing packages like admin_package and uncheck all boxes at 'available to' section except than, box for admin_type, like below screenshot.

http://forum.flynax.com/attachment.p...tid=2571&stc=1

Then you and nobody else can add listings for admin_package

thanks Bahram Soltanirad... so far it seems to be behaving as I need. Tweaking and testing now.