beta blockers? haven't heard that one--i would have to look into that. Rx of akathisia is typically w/ anticholinergics--benztropine or diphenyhydramine. 2nd line would be benzos.
Edit: Just looked it up on uptodate--they recommend benzos as first line for akasthisia, w/ propranolol 2nd line. They recommend benztropine or diphenyhydramine only as treatment for acute dystonia.