Revolution Engine v0.4 alpha 2's been updated to fix some bugs and add little improvements (e.g. a camera creation function). Some other things have also been included (as a new type of material). Remember that Rmd format is not supported yet, please wait to alpha 3. I've also found some bugs in the converter and will update it with the fixes as soon as i finish the specification and the loader.
Oh I almost forget, specular maps alredy work in basci material.
Enjoy the update!