Yes, you may find a need to adjust the development times as that is all the control you have.
I made my holga into a 35mm camera so the image bleeds into the rebate of the film.
So far i have not had to need to adjust the development times. However, one of my students has increased his development times and makes the dicision based on the light at the time of the shot.
It is great fun and in many ways very freeing IMHO. The work can be wonderful or boring as it is really going to depend on the person behind the camera (As , what else is new!)