Thanks, however I have no interest in typing chemical formula in math mode. First, it creates italic letters, which is inappropriate for formal report text. Secondly, in-line math screws up royally with subsequent placements of text on screen (Mac OS X 10.5, Maple 12). Thirdly, it is still somewhat of a pain to do this because it has to be done while typing the expression and requires an additional keystroke to exit the sub/super script mode.
I really want the ability to do KEYSTROKE BINDINGS to an existing menu command so that I can for example type Fe3O4, select the 3 and 4, and type ctrl-underscore to subscript them.
It strikes me also that a third party application may provide a solution. Recommendations for Mac OS X, Maple 12 would therefore also be appreciated.