Filter Tickets by Last Modified
It would be helpful if we could filter by Last Modified - e.g. Last Modified last week but not this week, so we can easily see if there are any tickets that we've missed out on updating.

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David O'Farrell commented
Was going to submit this idea and found yours so I voted for yours instead.
I know you can already do similar filters for Creation Date so extending that functionality to Last Modified seems like it would be straightforward.
In my case I'd like to create a view that shows me tickets that haven't been modified in 24 hours for followup.
There's another Uservoice post that mentions having another ticket date field for "Last Response" which would be helpful as well, so you could do similar filters for actual emails to/from the customer and not have your filter affected by someone changing the status of a ticket or adding an internal note.