Thanks for update, regarding my question about running, quote from dev blog below:
There is no running option - The main problem here I think is that backtracking through the areas you already explored, as well as moving through the non-hostile areas, such as the SGS, is too slow. I'm not quite sure yet how I'll address it. Just adding a running option is not that easy as there's a lot of stuff to be consider there and it would also need new animation on all those character models, etc. I'll have to think on how to address this one.