In docstring of `org-sort-entries' it's told "The command prompts for the sorting type unless it has been given to the function through the SORTING-TYPE argument, which needs to be a character, \(?n ?N ?a ?A ?t ?T ?s ?S ?d ?D ?p ?P ?o ?O ?r ?R ?f ?F)."
Suggest to extend it somehow like that way "... through the SORTING-TYPE argument, resp. customized `sorting-type',..." Which means `sorting-type' would need a defcustom. Thus the user isn't prompted every time any more. Thanks, Andreas