It appears that there are mappings for vocal ";dut!"; sounds included in the Snare and Bass instruments in VDL Template 6.0a, but there are no ";dut!"; mappings in the tenor instruments. I checked the Template 5.2.5 readme and it seems there is the same omission there.
Are these sounds not present in the tenor instruments, or are they just not mapped in the template? If they're there I'll take a shot at mapping them myself. If they're not there, is there a reason and/or can they be added the next time the Sibelius VDL template is updated?