Non-standard accumulation of points across a series

Hi,
I have searched the messages from the archives to find a solution to an issue I have, without success.
I have a complex series to score. For the GP14 Midland Bell we have 15 opens, 6 big events, 9 smaller ones.
To qualify, a helm must do 5 events, easy to set using the qualification profile. But....
He must do a minimum of two big events AND two smaller opens in the 5.
Can I get sailwave to do this profile?
A helm can have 3 big, 2 small, or 2 big and 3 small, which means I can't just run two separate series

I see in User interface the checkbox "Non-standard accumulation of points across a series" but I don't see where this is then modified.
Can anyone help or are we just too complex?
Many Thanks
Matt