More flexibility on when a room is reservable
Either a calendar to select which days a room is reservable/not reservable or the ability to specify which days of the week a room is reservable.
For example, I have a client that does not want rooms reservable on weekends.
Being able to set it on a per room basis in "Reservations -> Background Data -> Define Room Arrangements" would be ideal.

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Amanda Ferragine commented
It would be great if we could define room arrangement schedules that can be assigned to the room arrangement instead of just selecting Time days starts and Time Day ends.
Sample Arrangement Schedules:
Regular Business Hours: M-F; 9:00AM-5:00PM
After Hours: M-F, 5:00PM-11:00PM
Weekends: SAT-SUN, 9:00AM-11:00PMWe also require the ability to restrict SOME arrangements from being booked on weekends and Stat holidays.
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Li Liu commented
It will be great help to implement an option to preventing holiday or weekend booking in workplace.