Deductions & credits

Why is there a separate prompt for investment gains and losses that were not reported on a 1099-B, but not a similar prompt for interest not reported on 1099-INT?  Also, seller-financed mortgages are way down the list, but could possibly handle private mortgage entry?  (Idea being there is private interest, not reported on a 1099, but the mortgage holder was not a property seller, at all?)