Ultimate Driving Mode now supports Twitter! You can send tweets and have tweets from your timeline read out to you. While reviewing your timeline, you can reply, retweet, or like individual tweets. Support for sending and receiving of direct messages is also included.
Twitter support may be purchased in the Add-Ons area. If you previously purchased the add-on bundle, this is available at no extra charge, but you will need to log in from the Twitter section of the settings to get started.