As far as I know you develop a Mass Retweet Script written in PHP.
This script will run and select X users you chose from mysql database or from a file and retweet one tweet ID if it's doing these thing that will meets my needs .
but I have some questions :-.
1-Is it register at Twitter or it does not need that ,that's important for me because a lot app banned from twitter (may I can associated with a new consumer key ) .
2-How much users can handle for retweet ?
3-Does it have a proxies ability ?
4-Feel free to observe any ability your system has .