Hi Nate,
I wrote about this on slideshare.net/jdavidhill under Boston user Group Dec 2013.
- The lead will get the email at the next Cast. If that is 3 weeks from now, then they wait 3 weeks. If the next Cast is this Thursday, they get it this Thursday.
- You cannot change stream cadences w/o affecting everyone. You can use difference Cadences in different streams and move people around. Not really a great solution for what you want, but is possible.
- Some folks do use an Entry Program to send immediately and then push into the Stream.
For adding a Program, you can drag any program in (except email send). But each Program you add must have an "Entry Nurture" campaign that is set a certain way.
https://docs.marketo.com/display/public/DOCS/Add+Content+to+a+Stream
essentially it says "Member of Engagement Program IS TRUE; Program=X" and then it runs the flow associated with that campaign. Keep in mind this runs CONCURRENTLY alongisde the Casts.