You'll likely damage head formation/retention but apart from that you're not likely to do any real harm. My chocolate stout has never gotten any complaints about head retention from the folks who have tried it, mostly because it's too delicious to complain about. I say go for it.
Holy cow- you guys did it. The Kickstarter was successfully funded! Now the real work
Monticello Barleywine, Red Nosed Tripel
Cali Common, Imperial Common, Sunshine Belgian Rye, Sticke Note Alt
Cherry Blackberry melomel
Belma Pale Ale, Cluster Fug IIPA, American IIPA v1.0, rauchbier, roggenbier