Sorry for the slow reply. Thank you for taking the time to post feedback about the changes you would like to see, we really appreciate it!
Luckily, I am working on both of these changes (and a few more) at the same time. You will soon be able to control the slider from the Widget options, as well as include ReTweets.
You will also be able to add more than one Twitter account, and then choose which account you would like to display in the Widget too.
It is great to hear that you found it easy to use, that is the most important thing to us.
It is currently on a private Bitbucket repo, but there have been several requests to see it and I have no reason to hide it. I will try and put it up on Github tomorrow and ill post back here to let you know.
Thanks again for taking the time to give us feedback and suggestions!