In the Membership plugin, under the member admin page (/wp-admin/admin.php?page=membershipmembers), there's a filter that allows you to add extra columns (members_columns), but when the table is rendered, it's not supported. What's up? Is there a reason for such behaviour? I've checked out the source for the view, and it's pretty clear that the table CONTENT is laid out statically without support for extra columns. I'd be willing to write and submit a patch, assuming that it could be QA'ed and verified by the next update (which would save me from having to customize this version and freeze it).
Please let me know.