tax question regards primary residence partial renting

Hi, i own my primary residence house and rent out one bed room (10% of total square footage) out of 3 rooms, and have questions:

 

turbo tax only want to use square foot method to split both rental related expenses, property tax as well as depreciation, but since there only 2 people live in the house, does it legal to use different method to maximize deduction and minimize depreciation?:

 

1, for utility expenses, can i split based on number of people by 1/2? 

2, for property tax, insurance, HOA, can i split by number of people, thus 1/2?

3, then for depreciation, can i change to square foot method, thus deduct 10% only to prevent tax recapture raise up bracket when sell?

 

thank you for help!