Opportunity based Email Automation (versus staff based)

One key reason our Org chose Bloomerang Volunteer was because the breakout of Opportunity (versus Organization) allowed us to assign roles specific to the opportunity even though the person may have qualifications (and roles) that differ in other opportunities. This works GREAT for us. However since all of our serving opportunities are based on max 1 week long events - with a number of "shifts" in each opportunity - we need to be able to send confirmations / feedback requests based on Opportunity Dates - which is not currently an option. This would be a BIG benefit to us.