Currently you can view only the assigned user's name on a ticket in Agile board. I've created a task based on your request http://youtrack.jetbrains.com/issue/JT-19118, you are welcome to vote and leave comments.
As a rough workaround, you can configure notifications on created issues in your projects. In this way, developers will be notified about all created issues and their reporters. For that, create a saved search (i.e created by: {Testers}), make this search visible to needed group (by clicking "Edit" on the saved search) and enable notification "on issue created" in user's "Profile". Also, user with admin permissions is able to allow this notifications for all needed users by himself(navigate to "Administration" area -> "Users" -> {user} ->"Profile").
Note, that you can receive notifications both via email and jabber.
Thank you.