To do a type/ baseline shift in Illustrator requires that one Preference be toggled ON. That's just in order to see the option in the Type pallet. I'm sure you know which one, so I won't bother telling you. If that pref is NOT set to ON, the user will not be able to find Baseline Shift, let alone use it. I wasted an hour or so trying to find it, then gave up and did the baseline shift in photoshop. I asked on the AI Forum, and got many answers, none of which tipped me off-until I had already figured it out on my own. So figure it out on your own, then include something in the documentation about it.