Proposal: reminder to the assignee when a ticket is unchanged more than 3 days

[js]

I'm not sure whether Trac has this capability or not,
but I think having reminder would prevent maintainers from
missing their jobs.

The reminder would be sent to maintainers when
 - the status of the ticket remains new more than 3 days
 - the ticket has a patch to review but not answered more than 3 days
   (How is this possible?)
 - etc.

Any comments?