Date Adjustment Buffer in Days - is it possible to specify the buffer only for the Finish Date?

We have used the Date Adjustment Buffer in Days to extend the Transaction Dates against the Planned Dates. In our case we need however to extend just the Finish Date in order to accept transaction after the planned end date, but we would like to keep the Transaction Start Date the same as Planned Start Date. Is it possible to achieve that?

Thank you

Maciej