It's currently possible to set an object's rotational centre point (the crosshairs) to 9 explicit and accurate positions by using the wee 3x3 icon (mouseover says it's Set origin position, which is not what I thought a rotational centre would be called).

Any other position requires drag to more or less where you want it, and accuracy can be improved by zooming in, but it's still not an exact way of placing it.

I haven't seen any of the co-ordinate boxes change as I drag the crosshairs around -- have I missed something?

If not -- it would be useful to be able to type in X,Y co-ords to set the rotational centre explicitly and precisely.

Allied to this, the ability to "align centres" about a collection of objects' rotational centres would be useful in some cases.