Guys i think creating good custom fields really solves the problem of AI setting silly fields.
There are mainly two problems with regards to AI FIELD PLACEMENTS.
First, the default fields are too limited and most of them are not that good (for all formats short, medium and long). Second, the AI only selects aggressive, attacking and balanced fields.
I recommend creating good custom fields as per your batting strengths and weaknesses to have good challenging fields. Have varied custom fields so AI has good options to choose from. Also, mark all custom fields only under aggresive, attacking and/or balanced. For eg. I created 4-5 good defensive fields and marked them under balanced. I think create 4-5 custom fields under each field tactic (aggressive, attacking, balanced, defensive, very defensive etc. but mark them only under aggresive, attacking and balanced). Do this for all three formats short, medium and long for both pace(any) and spin(any).
This exercise will not take more than couple of hours and the results will be fantastic. I think there is no point in waiting for upcoming patch to solve field placements issue of AI setting too attacking fields as the bigger problem is that default fields are simply not good enough (and i doubt they will add more default fields in upcoming patch though i may be wrong). Plus it is very easy to create custom fields and not at all time consuming.
This simple workaround has really helped me.