Back in February, I submitted this idea: Enable the ability to edit the Program Member date when uploading leads into a program
Now that I think of it, it's not always the member date (the lead may already be a member when they registered), but the timestamp that occurs each time program status changes. Just so I'm clear, I'm assuming Marketo simply takes the date - contained in the activity log - where a specific program status was achieved and this is what's used in the program membership analysis reports in RCE? If so, I'm not even sure how this would be supported given the current architecture. You would almost need a separate date field for each program status. I'm just trying to think this out loud in the community in case someone else has any other ideas. Once I have more clarification, I will update my idea accordingly.