Casual and Part Time Employees
We have a mix of Full-time, Part-time and Casual employees. I'd like the ability (at least with Part-timers) to adjust their availability through a normal week. For example, we have a guy who is at University on Tuesday, so I'd like a way to ensure his working week is reduced to 32 hours and tasks that are allocated over the week don't fall on a Tuesday.

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Brian O' Connor commented
This would be a great feature if it could be implemented. Availability setting for each user and resource. Number of hours available each day of the week. For example, it would allow a half day worker's load to go to the red status in the availability layout, after four hours, if I had them set for four hours that day.