I've been working on a partial-rewrite/splitting of Mapper into libraries and components. Unfortunately it takes a bit more time than I have and delays releasing a Mapper 2.0, so I decided a couple of weeks ago to work a bit on the old Mapper branch instead and fix some of the most annoying bugs and add a couple of features to make it nicer to use.
A new release is already out, available at mapper.tal.org tablet repository. Sources can be there too for those who need them.
Oh, and I will probably release a new version today, fixing a couple of bugs in the above :)