Posted by franimals:
You can do this by choosing Repeat and then clicking Advanced Options. There you'll see that Every Weekday already is an option. You also can set it for every Tuesday or every 3 days like I think the OP requested.
Posted by Salgud:
I support being able to set repeating tasks in any form and being able to stipulate "only on weekdays". This would be a great feature!
Repeat every weekday is already implemented, but repeat every X weekdays is not. Repeat every week in a given weekday is a paticular case where X = 5.