Those are coming in from the SOAP or REST APIs. In other words: from some kind of integration with Marketo, either developed by yourself, or used by a LunachPoint partner that you do business with.
You will have to manage this information though custom fields. We usually set up a "Source detail" field that we populate as needed (in your case, through the API).
I have one last question on this. If you create this "Source Detail" field that would trigger when a lead gets created via the API, how would you know the source of the API call to correctly assign the values? As of right now, it seems like "Web Service API" is the only bit of info given when I look through the record's Lead Activity.
Could you expand on this? I'm having a similar issue where we have leads coming in via two LaunchPoint partners, and I'm struggling to find a way to distinguish between the two. How would I customize the API to populate a field that isn't on the form?
Add an "API partner" field and ask the 2 launchpoint partners to populate this field with a value that is different for each of them and will enable you to know which one did create the record.
Or, for even better tracking, work more closely with the partners to not just insert leads into Marketo. Get them to direct those leads into specific Marketo programs/activities so that they can be assigned proper leads sources, added to nurture, sync'd to SFDC campaigns, etc. I personally would find it a bit alarming to have raw lead records inserted from an API without more control over how they are processed and tracked.
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