What I do is simply make 5 copies of the task, one for each weekday, with a start date so it doesn't show up before its day, and set to repeat weekly. I'll often put the weekday in the action name in parentheses just to help keep it straight if I miss a few days and have to reschedule them. Here's an example of the obvious thing (which ends up with unwanted repeats on the weekend) followed by my version. Note that in mine, the repeats are every 1 week, not every 1 day, and that the project is set to be parallel so that Tuesday's action isn't blocked by Monday's action from next week, as OmniFocus will insert the new action for Monday next week immediately after Monday's action of this week. Also, if you are viewing available or next actions instead of remaining actions, you won't see all the other days if you've set up start dates.
It's a bit more work to set up, but less work on an ongoing basis.