We would love to add support for other databases, but we need help from someone experienced with those databases. If you have an interest in joining the development team in order to build SQL generation for other databases, please let me know and I will get you started.
Since we have moved the code for the SQL generation to our template language (sisula), anyone who wants to make a port needs only a good understanding of the target database and a minimal knowledge of JavaScript. In other words, there are no technical obstacles from a programming point of view.
There may, however, be technical obstacles from a database feature point of view. There is, for example, no support for table elimination in MySQL, which means all features cannot be ported. Both DB2 and PostgreSQL have table elimination, but I am not sure if other features are missing, such as the ability to create parametrized views, clustered indexes (or index organized tables), foreign keys, column statistics, etc...
