Not a current SCMS machine that I'm aware of, but I think there are/were some radial arm saws that could take a dado stack.
IMO though you're better off cutting dados/housings with a router. With stopped housings the router wins hands down, but even on through housings I tend to use a router. Occasionally I've used an SCMS for angled through housings but even on a top quality machine the bearing arm isn't quite as robust as I'd like, so unless you're absolutely consistent in operating the push stroke the depth of the housing can vary by a few tenths of a mill. I've got a dado stack for my table saw, furthermore it's settable in 0.1mm increments, however it only takes a bit of sawdust on the table surface to throw out the accuracy. Consequently I tend to stick to the router.
Just my 2p's worth.