Mass Update Custom Fields

I would like the ability to Bulk Edit a Custom Field (or allow Custom Fields to be edited in the Mass Update screen).

We utilize a Custom Field to track membership referral. During signup, if a new member was referred by another existing member, the existing member get's 20% of the new member's membership fee as a Referral Bonus / Fee.

At the end of each year, I have to manually reset all the Custom Fields to Null so I can track this from year to year.