how to develop at 300ppi?

When I develop out files, it processes them to 240 ppi. I cannot find a preference to allow processing at 300ppi. When I export files after developing, the only processing options seems to be 8 bit or 16 bit and color space. Is this just a functionality that is not yet included in the beta or am I not looking in the right place? I end up having to batch an action in photoshop to get them to 300ppi.

On a side note, I think lightroom is brilliant - unfinished but still great. I'm looking forward to its official release.