Feature Request: Ability to add custom "custom URL" plain text field

[theskyfloor]

It would be awesome if the plug-in allowed through an admin interface or a JSON config file for developers to add custom "custom URL" plain text links. For our use case it would be so we could rely on the same field to provide an asset OR a link to something like a SoundCloud track but it would expose that metadata as a link type - so that {{ entry.linkItField.type }} would return whatever the customized string would be.