Yes, it was F2! After a little bit of fiddling, I’m down to a reasonable 3-step quad creation.
-select the vertex
-press F (shift-f in my shortcut setup)
with the autograb option enabled, left-click to place the vertex.
Do you think there’s ever going to be a blender toll that mimics the topogun/3dcoat functions of, after finishing one quad, automatically reseleting the next vertex in line to reduce this to a two, or even one, step quad creation?
If anyone knows of such tools, they’re more than welcome to share!