Hi Alind,
I have not yet added the support for alternative widgeting systems, but this functionality is planned, especially with the performance improvements tw2 provides. The challenge is to get sprox to work with both tw and tw2 simultaneously. I believe sprox is relatively well-factored for this, but some factorization will be required as was the case for ming/sa integration. If you would like to start on this work, I would appreciate a pull request.
cheers.
-chris