Allocate kit child revenue based on discounted sales amount field

I recently switched my software rev rec from non-inventory for sale items to kit/package items. Each child item from the kit should be split 50/50 for revenue purposes on the revenue arrangement - one point-in-time element and one ratable element. I noticed that when a revenue arrangement contains more than one kit item, the quantity of revenue element lines are divided evenly into the revenue arrangement total - I believe that this could be problematic for my revenue by item report. My fair value formula is {totalsellingamount}*.5. How can I correctly assign values to the child elements created from the