my version is in Danish, so these are my translations of the User's Interface:
Open Malwarebytes 3 > Settings > Schedule scanning > check Type > click Edit , then in Type of Action change "Normal", to "Defined by User" or Hyper.
1) I am not quite sure, because I can't remember this part, but you may have to first delete the job that was already there (instead of editing it), and only then create a new job with your preferred type of action.
2) oh, yeah, Fill "Exclusions" with everything you already trust. Why not?
Malwarebytes 3 is easy to live with, but we have to do the settings, don't we.