But concentrating too much on his batting may make him focus less on bowling. We all know what happened to Irfan pathan's bowling when he was made to concentrate on his batting. He should be given more chances in shorter formats though as a specialist bowler who can also bat.
He doesn't need to do anything more on his batting really, its good enough as it is. Hes averaged nearly 80 in FC and I'm pretty sure he was working more on his bowling than his batting. Plus Watson focused on his batting more and now hes considered one of the best if not the best all rounder atm. His bowling has not suffered either, its actually become even better than it was before.