Well done AQB Soft team.
Just a few suggestions to improve on the module to make it more robust:

A delay until display in seconds - Which will allow x number of second to pass until the message displays.

A option flag or counter on how many times to show the message. - Some message may only need to be shown once or once per day and not pop up every X number of minutes.  
This option will allow specific warnings, notices to be placed in locations on the site. eg a group url for eg. to be able to notify a group. etc. of something.