I would have given 5 starts if the component have provided the facility to remind the existing user, who already have registered but not come back (logged in) since long time.
With version 0.4.x I am planning to add in additional functionality as you have stated (this was initially out of scope of the original project). This will provide the ability to send reminder notifications to existing user, who have already registered but not logged in for a period of time.
I have some points:
1) Many of Indian Joomla web administrators looking for indic writing solutions to their online contact forms such as guest comments & feedback. Is it possible to provide this nice extension to front-end, enabling the readers to utilize it while filling the forms?
2) The word "plug-in" in your module description is bit confusing.