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If you weren't having any leg/knee/foot/bikefit issues or pains before fitting the bag I wouldn't suggest trying to change your fit or changing what works for you to compensate for the bag.
If you were already having issues/pain with your knees tracking weirdly or felt that you needed insoles/arch support prior to using the bag, then I guess it's worth considering. But yeah, don't change just for the bag.
I bought a framebag (Restrap) to use for touring in May. I used it yesterday to try it out and for a lot of the ride my legs rubbed against it, which has caused some fraying to my bibs shorts.
I know this is because I'm flat footed and when I walk or cycle my feet roll inwards.
Whilst riding it felt as though I was naturally compensating for the bag (causing some odd aches as I held my legs in a way I usually wouldn't) and my legs weren't rubbing the bag as much at the end.
Will I adjust to the bag naturally, should I try insoles or is a frame bag just not for me?