I only use corn and have for the last 15 years. the only thing with mixing other things with the corn, is moisture and molasses in the feeds.it sometimes sticks it all together, and want come out of the feeder.
the deer will come to the corn , just as good alone as with other things added.thats what I have found.they do make dry mixes that you can pour into the feeder to add smell to it. it comes in peanut,peanutbutter,and soy.I couldn't tell any difference when I add it or when I didn't.

you could get the molasses and pour it on a stump or in a container.a friend that lives next to the state park has a feeder made like a box,they pour corn and horse feed into it each day. they have 15 or 20 deer at a time around it.