[phenixbb] Refine pixel size for EM map?

Hi, I remember asking about this some time ago, but I am not sure if it was ever implemented. Is there a way to refine just pixel size for an EM map in phenix.real_space refine (or another phenix utility)? Even just automatically rigid-body fitting a crystal structure and calculating the pixel size with max correlation would be handy. We do this at the moment using Chimera/ChimeraX, but an automated way to do it in phenix would be handy. In the absence of a crystal structure, I wonder if directly refining pixel size during real space refinement would be possible/reasonable at higher resolution (<2Å)? Cheers Oli