I could have a case where the work week starts on Sunday and ends on Thursday, and I want to be able to denote this in the scheduler.

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ADMIN EDIT

For the time being, you can consider two options (separately or together):

• use the Multi-day view to make only the desired days visible in the scheduler (its NumberOfDays parameter combined with the scheduler's Date parameter control the start date and how many days will render)
• use CSS like this to remove the darker coloring for non-working slots so that there isn't a visual distinction that is wrong:

      div.k-scheduler .k-scheduler-nonwork,
      div.k-scheduler .k-nonwork-hour {
          background-color: inherit;
      }

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