White-listing would be a valuable feature for a future release. Users should be able to white-list apps as well as websites (or just domains).
White-listing a website or domain could be as simple as prompting the user with a text box where they can type in their desired URL.
Choosing to white-list an app could open a full list of all installed apps on the device, which check boxes next to them. The user could then select one or more apps to white-list, and then click OK.