PHP Program Modification

I need modifications to an open source php program. The code is here, [login to view URL] Modifications needed follow: 1. Allow the user to set a delay in minutes for automatic following of Twitter accounts. This delay should be a variable number. In other words, there will be a min and max like between 1 and 7 minutes so there is no pattern in terms of frequency. 2. Allow the user to set a max number to follow or per day 3. Allow the user to set a delay in minutes for automatic unfollowing of Twitter accounts. This delay should be a variable number. In other words, there will be a min and max like between 1 and 7 minutes so there is no pattern in terms of frequency. 4. Allow the user to set a max number to unfollow or per day