I understand how to do this from the form manually, but that is very prone to error and where you have a lot of subscribers, it's slow.
a) It would be great if the user_id field could be populated or replaced with the output from a table/view in SQL (in the same way that some mailing packages allow the addressees of mailings to be specified by a table/view so that they can be dynamically controlled).
b) I can probably make some SQL to populate the field myself. At the moment it's a varchar(255) - is there any reason that the field cannot be extended up to the limit for a mysql varchar field?
Bob