Hello there,
I would love to implement the chrome extension for doing bulk tweets.
I have developed many chrome extensions in my career and i have 5+ years of experience in this domain. Using my skill-set, I can deliver this to you in less than 4 days.
You can check my portfolio to see the latest extension I have implemented.
For your extension, I can deliver all 5 of your requirements. And, the configuration page will allow to add as many twitter usernames you want. The extension will tweet to all those users (not restricted to just 3 users) with the configured amount of time (in seconds) delay. And you don't have to keep twitter page open as well, all you'll need to do is just be logged in on Twitter, thats it.
I would like to discuss the other details as well with you , so would be great if you can ping back on chat. Hope to hear back from you on this project.
Thanks,
Have a good day