OpenEMM Support

Technically I can do what I want to do via "Date based mailings." I want to stagger some mailings out several days apart from when a person subscribes to my list. I read:

"You can define three target groups greeting (creation_date +1 = sysdate), followup (creation_date +3 = sysdate) and reminder ...

Is there an easy way to change the delay on an action? For example, the options are 1, 2, 4, and 7 days, but what if I want to add delays of 3 days, 10 days, and 14 days?

I don't know Velocity.

Thanks for any help