Facebook from the very beginning has maintained that likes and shares are going to be same thing. In fact, according to Facebook, the share functionality that we use currently in rtsocial, has been discontinued(?) long ago!
Recently, there have been a lot of minor changes in Facebook's API. One of which says that the current like button will be discontinued (it already has been, apparently in November). This new like functionality will require an app registration but will allow people to build custom like buttons. This means we'll be able to have a 'proper' like button as soon as there is absolute clarity on this.
Other buttons are in the roadmap and the code is being rewritten. However, like I mentioned before, the work's paused for a while, in favour of some other, more demanding tasks we have at hand. You might want to contribute to the development with your suggestions. In fact, I'd like to invite you to add the 0's issue in the issue list here: https://github.com/rtCamp/rtsocial/issues. This helps us track and fix issues better.
Finally, thanks for your support and encouragement.