Source Code for New Records through Advocacy

When someone takes action through our Advocacy action page, and they don't have a matching record in our databank, a new record is added. Is there a way to change the Source Code that gets added to those new records? I believe right now, they get the source code "Join Network Form" - but I'm wondering if we could change that to be more indicative of the Advocacy Action form. I know they also get a contact note when they send a message to their legislator, but if it's possible to distinguish the source code too, I think that would help. It would be a quick way to find new records that are added through Advocacy. Right now, the source code that is automatically added is the same that is added when someone joins online.