Render to texture as HDR!

Hello! Is it possible to render-to-texture as HDR image? So that it renders the result in .exr or .hdr format? I need to render 6 images of cubemap in HDR for Worn Tires so reflections look natural…

Martinsh told me about a chance to use floating point color buffer for HDR reflections, HG1 referenced me to here(for FPCB) http://www.blender.org/api/blender_python_api_2_75_3/bge.texture.html?highlight=imagetoarray#bge.texture.imageToArray, but now I need to really use it to get HDR reflections that has nice exprossure effects.