Redmine

I know there is a plugin that will send alerts if a task assigned passes the "Due Date", but I am looking for a way to notify individuals assigned to a tasks that essentially "do nothing" to that task for x amount of days.

In our development environment, we do not go by due dates, so we do not use them. I would like to be able to set a task to send a reminder to the assignment if a pre-determined number of days pass without him/her touching the task.

We have a problem with individuals not moving the tasks to the next process after touching it, would like something to nag them.

Does this make sense? Is there a plugin, or existing way to do this?

Thank you in advance!