Several of the new models are capable of managing it - but in a different way than before.
You could plan a route to the end, then add another 9 intermediate stops. This can be planned on the device, but the web site provided makes it a good bit easier. The device will then use traffic and average speed information to pick the best routing between each of those stops. You can also save routes of that sort both on the device and out to the web.
It's not quite like the old itinerary file method, but it works.
There's another way to force a very specific route (it won't try to deviate at all, bypassing the routing engine and ignoring any traffic situations) by saving a specific flavor of *.gpx file to the web and letting it propagate to the device. Not always practical, but very deterministic.
What other features are important to you?