I find its always best to put bat/bowl bat/keep in the bat positions, if a bat/bowl gets out early they always have the chance to snag a few wickets and arent dead in the water.This was a stat I found really interesting last year. Of the top 20 averages from last year these were their positions:
BWL: 12
BAT/BWL: 7
BAT/WKP: 1
BAT: 0
The way the scoring is set out it really lends itself to bowlers.