Add ability to specify 2 or more explicit days in a single availability day/time field

Right now, an asterisk (*) can be used to signify that an availability time span applies to all days in the rotation (week).  Otherwise, it takes multiple entries to cover multiple days:

• Mon 3:00 PM
• Tue 3:00 PM
• Thu 3:00 PM
• Fri 3:00 PM

It would be nice if there were a way to specify multiple days in a single entry.  Something like this:

• [Mon,Tue,Thu,Fri] 3:00 PM

This would reduce the number of availability entries that users have to enter.