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In all file managers, I miss an API point where one can give a userdefined sorting function for the file and folder list.
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In all file managers, I miss an API point where one can give a userdefined sorting function for the file and folder list.
Regarding your second point, that's not really what a graphical file manager is for, I think. At this point (likely even earlier) you would be better off just writing a simple script in the scripting language of your choice. (If going for something fancy, you could also implement a FUSE based on symlinks for the original files, where the filename is prepended by a sort key. This would work for every major file manager and you could manipulate the files in mostly the same way as before.)
Paragraph 2: I am not sure what you mean here with writing a script. The graphical file manager shall sort its file list using the sorting function I hand over to it.
"That's not really what a graphical file manager is for". Says who? Every software which has a plugin system does that, why should a file manager not?