I've seen a number of threads asking about sorting the queue view or dashboard by Last Update, but all of the solutions I found apply to older versions.  Any hints as to how to do this?  I was thinking about using

 TicketFreeTime,
priority,
Ticket::Frontend::AgentTicketQueue###SortBy::Default:
--> something other than Age,
DashboardBackend###0130-TicketOpen: (currently Age, tried setting to Change, Update, LastUpdate, etc.)...

I know change_time is stored in the db, just a matter of getting access to that...

I'm not 100% sure if LastUpdate is the terminology, but I'd love to sort by the time since a customer last emailed.

thanks!

-Scott