Master volume link for s/pdif

Please can we get volume control for s/pdif and a link to master volume. You say in your manual it is best S/PDIF does not have volume control and it should go out at full signal but giving it a link to master volume does not change that as you can still choose not to link it. My reference monitors are s/pdif input and work great connected straight from the kemper but with no volume control it is not possible to use as I would blow my head off, far too loud. So please can we get a master volume link for s/pdif.