This is something we really need too.
Our use case is that we want to have all of our customers paying by credit card to lessen the accounting workload of tracking Direct Debit payments.
However we have a couple of big customers who insist on Direct Debit and they are big enough that we have to allow this for them. But we don’t want it to be an option for the others.
And no, leaving it available and then just telling them afterwards that they can’t use it is not acceptable as that just upsets people.