Better control of setting vector values

[chkworks]

Right now, when setting the values for Vector2, Vector3 and Vector4, they are applied in reverse order, so for example for a Vector3, the first value to set is the Z, then the Y and then finally the X. This is fine, I guess, but when moving vector values really close to each other, they are again stacked in the same order.

It would be great, if the handle that was moved latest stayed on top of the others. Additionally it would be awesome, if you could hold down X, Y and Z on the keyboard to only make this axis selectable.