Thanks for the response.
I’m looking at your code now and it seems that I can do this by retrieving, “retrieve_from_value” from the options and passing it to, “gce_print_grid” in whatever format it and “GCE_Parser” parser need it. Maybe other places, too – I’m not done digging through it.
I suppose I could also add a new shortcode attribute to toggle this on/off. I’m only using a single feed, but I suppose it’s more correct to get the “retrieve_value_from” for each feed and pass the earliest one when printing the grid.
Let me know if you want me to send you the code if I do this. You are welcome to it.
For what it is worth, I’d donate to support a generic plugin for mapping fields from the WordPress usermeta table or for Chad Butler’s WP-Members plugin, specifically, which stores values from a custom registration form in usermeta.