Having the ability to add a multi-date range for holidays would be very helpful.  For example, Spring Break: March 16 through March 20.  This is common for schools and other businesses that close for extended periods over certain holidays.

This would be a helpful enhancement for us as well. 

This would be very helpful.  We also have 1/2 day holidays but we cannot currently account for that which will skew our SLA's.  Please allow for a time for the date.  Default it to 24 hrs, of course, but give the option to make it a half day (and by our choosing of what that half day is).