Some customizations for Magento refer a friend extension

Project Description:
We have a Magento Refer A Friend extension from aHeadWorks, and we need some modifications to implement new functions on the website. I need someone who had done this type of customization.

Please see the following links for this extension.
http://ecommerce.aheadworks.com/magento-extensions/refer-a-friend.html

There are the requirements
1). Create and able to set a time period in days (7 to 30 days) before SENDER can receive their credit from their referred friends after made a purchase. There must be a notification for SENDER for this delay of time period

2.) The admin will able to automatic send out notification to SENDER for this delay of time period.

3). The SENDER WILL NOT get the credits if their referred friends return the product within the return policy period. So the admin will be automatically able to identify if the Referred friends made a return or not. If they do return it, the SENDER will not receive the credit, if they don’t, the SENDER will receive the credit after the Set time period or return policy period.