It would be handy to enable dates/disable dates based on an array of dates. 

I have a situation where drivers are scheduled jobs that may exclude days within a 3-week period.  Currently I can only select set the minimum and maximum dates for this period which allows them to select dates where no work is scheduled.  Consequently my code must check if the selected date "is valid" before allowing displaying the jobs for the selected date.

Obviously it would be far easier if those dates were never enabled in the first place.