Hi,
I just uploaded a plugin I created called
autotweet, which automatically sends a Tweet to Twitter after changing/saving/updating pages that contain the ~~AUTOTWEET:~~ syntax.
The Tweet can be specified to your needs using a configurable message template.
Get the plugin or read the plugin documentation here
Requirements
* You must have the cURL extension for PHP installed
* You need a Twitter App, which you can create from twitter. (You need consumer_key, consumer_secret, access_token and access_token_secret to talk to Twitter via the oAuth authentication protocoll)
Whilst there's not additional button, I hope this does what you want.
Regards,
JDT