New Feature Add Suggestions Needed

Hello everyone.

I would like to add few features into my plugin which is making me confused and thinks may be there is no good idea to add those features, Please have a look and give your precious advice.

1- Add a Reminder Notification for Leave a rating if you are happy with plugin or item
2-Add a Reminder notification for buyers that their support extension is expired if you like and want then you can renew it.
3-Add code for checking item or plugin is useable only in one project and for next project please buy another license.

I am confused so any suggestion would be appreciated.

Thanks in advance