Respondants typing formatted text into a Form

I currently have the Windows version of Acrobat 8 and Life Cycle Designer. I've been playing with converting pdfs of student Workbooks into Forms, so that students can type their answers on the computer, rather than writing on a printed Workbook. However, this solution is not viable for me (a chemistry teacher) unless students can type superscripts and subscripts in the form fields. I can specify a font and style for a whole field when the Form is created, but there seems no way, with Acrobat 8, for the student filling in the form to make formatting changes to the text they enter.

But does Acrobat 9 have this feature? If it does, I'll buy it.

I am assuming that even if it does, you haven't included the ability to insert calculations into form fields. I don't mean the answer, I mean the 3-line algebraic calculation that starts with the formula and ends up with the answer. If a version of Acrobat had such a feature, or as an add-on, it would make it possible for students to do all their work on the computer. Something for Adobe to consider for the future, perhaps?