Implemented, a bit differently than I originally thought.
This code is in the serializer (beta) branch, which will become production in a week or so.
The tweak documentation is:
Code:
# Set custom metadata fields that the content server will or will not display.
# content_server_will_display is a list of custom fields to be displayed.
# content_server_wont_display is a list of custom fields not to be displayed.
# wont_display has priority over will_display.
# The special value '*' means all custom fields.
# Defaults:
# content_server_will_display = ['*']
# content_server_wont_display = ['']
# Examples:
# To display only the custom fields #mytags and #genre:
# content_server_will_display = ['#mytags', '#genre']
# content_server_wont_display = ['']
# To display all fields except #mycomments:
# content_server_will_display = ['*']
# content_server_wont_display['#mycomments']
content_server_will_display = ['*']
content_server_wont_display = ['']