What would you like to see added in this software?

Currently, apps like fMRIPrep and ASLPrep ignore modifiers on non-standard spaces (e.g., --output-spaces anat:res-01) and combinations of modifiers (e.g., --output-spaces anat:res-native:res-01).

Since resolutions are arbitrary labels rather than actual voxel sizes, unless we implement some kind of syntax for defining resolutions on the command line, these apps can't make use of modifiers. I do think creating a syntax is a good idea, but that's something that will take a lot more effort. For now, I propose updating OutputReferencesAction to raise an exception instead.

Do you have any interest in helping implement the feature?

Yes

Additional information / screenshots

No response