Andy - once you add a term and it goes to QuickBooks, it really is no different from a term you added directly in QuickBooks. Neither QuickBooks nor Method treats it any differently.
However, the one exception is more complicated. If you add a term in Method, but it hasn't synced to QuickBooks yet, you can still edit it. Method will treat it as being in in "ADD mode" until it actually gets picked up by QuickBooks.
Paul