I've looked as hard as I can and I can't find that filter on Windows version of BidX or the ipad version.
Is it possible that's the same thing as "true pay" Paul has previously used in BidX?
I assume everyone on the 777 understands that block hours scheduled on a flight over 10 hours are part of the trip guarantee. The block hours between 8 and 10 are called BKO and don't get paid until they are flown. If a flight scheduled for 13:15 is under-flown by 10 minutes, then the 2 hours from 8 to 10 will be reduced by that 10 minutes. The BKO, will end up being 1:50 rather than the potential max of 2:00.

Paul allows someone to rank order trips/lines by the "true pay" which includes the assumed best case of BKO being its maximum number. Is that the OSC option you're talking about?