The CAA have certainly tried to do this, and by their involvement in the Small Helicopter Safety Group so have the BHA.
The CAA published AIC Pink 146/2012 at the end of last year, looking at precautionary landings in deteriorating weather. It was circulated to all the members of the SHSG by its author prior to publication and several of us did comment on it, which resulted in some minor tweaks.
I agree a precautionary landing is sometimes the best option rather than pushing on, more education is needed to convince pilots they wont necessarily get the book thrown at them for doing so.