R03B551 and auto-receipts

Using F03B13Z1 and auto-receipts then running R03B551 with invoice match (R03B50D).

I know in P03B52 you can set tolerances for applying receipts of what to do with underpayments and overpayments.

However we have an application that reads the F03B11 table and knows what the customer ledger looks like along with every invoice and every credit.

We'd like to be able to NOT use the tolerances in P03B52 and 'run the show' ourselves meaning if I want to put an underpayment to my write-off account then I want to put the write-off account in GLBA on F03B13Z1.  Similarly if I want to overpay an invoice BUT have the overpayment amount ALSO go to my write-off account then I want to put the write-off account in GLBA on F03B13Z1.