I've seen a couple of MODs that renumber the Field #. They just insert the new field in links.cfg and renumber the subsequent fields.

What is the danger in doing this?

Things that I know that would have to happen
-- Several other assignments in links.cfg such as "Field Number of some important fields," "Field number to sort," "Field names to search on."

--the Database delimeter | would have to be inserted at the appropriate place in links.db

Anything else...