In reply to Ramblin dave:
It completely fails on at least three of your specific criteria but I currently use a RAB Boreas for most of the situations you describe and find it suberb in all but the windiest conditions.
In summer I wear it over a merino T-shirt for the bulk of my climbing. On Saturday I wore it over a RAB AL long-sleeved base layer whilst climbing at Winspit in cool, windy conditions and in Scotland in Winter I regularly wear it for walk-ins over either the AL or more commonly my warmer RAB Baseline Hoody.
It probably isn't ideal for long days of Winter hillwalking on exposed summits but for general 3 season use and fast-moving walk-ins to Winter crags I find it ideal and more versatile and comfortable than a traditional windshirt. The RAB SWS (single weave softshell) fabric also probably less susceptible to damage from Gritstone chimneys etc. than pertex.
The lack of pockets for hat/gloves is a minor inconvenience but a hooded baselayer solves the hat issue and liner gloves generally fit in my trouser pockets.
It might not suit you, but for me it has greatly increased the clothing options I have available.
PS had completely forgotten about the full-zip version mentioned by George!
Post edited at 13:56