Redmine

Hello guys

We use Redmine for tracking the implementation of the connection to Internet of our customers. Sometimes we has connected customers at the small period - for the test. I has faced with the challenge - I need to add a field with the date (end of the test) and a simple tick field that mark a issue as a test. If a tick is set date field must be required. If the tick isn't set then the field with the end of the test is not required. After the moment when the date of the end of the test is expired Redmine should send a email to the issue author that the test is over. Is it possible to implement this feature? :-) Maybe someone has done something similar. I would be glad of any help.

Thanks in advance.