[phenixbb] coordination of metal ions

Dear Phenix-devels Is it possible set up geometric restrains for metal ions bound to protein in phenix.refine? elbow.builder seems only to work on separate molecules and not on metal ions with its coordinating sidechains. I found the feature to introduce custom bond distance between two atoms, but what about custom angles? And by the way will this these custom setting ignore Van Der Waals radii? or is there a way to set these for special atoms? Thanks! Jesper