version which includes as awesome feature that i searched SOOO long in blender. it is the “lock track” constraint for armatures.
this is very usefull for things like robotic links or turrets on spaceships.
You don’t have to vote, it’s going to be in the official Blender sometime in the near-ish future. Cessen’s been a bit busy lately though, so we’ll have to wait until he gets time to integrate it.
The feature is very nice, though you didn’t have to wait for it. With a bit of imagination, you can achieve the same with a help Empty and the ‘Copy Location’ constraint with one coordinate turned off.