Would it be possible to expose the FSC mask auto tightening procedure used during refinement as a separate job type (or perhaps an option in Volume Tools)? I would see the inputs as being two unfiltered half maps and an initial mask. This would allow easier comparison of results between cryoSPARC and relion, and more generally it is useful I think to have an objective procedure for generating an optimal mask for resolution determination.
It would also be useful to have a simple FSC-calculation job, where the user can provide a mask and calculate an FSC (e.g. to check domain-specific res).