1. A method for characterizing an accessibility of potential stimulus sites in connection with surgical planning for implant of a cardiac medical lead near a heart of a patient, the method comprising: obtaining image data representative of a coronary venous system for the heart of the patient to receive the lead; generating a venous map, based on the image data, representative of venous pathways for the heart of the patient; analyzing the venous map to identify pathway features of interest (PFOI) within at least one select region of the venous pathways; assigning scores to the PFOI based on at least one of predetermined feature-complexity relations or physician-entered complexity updates; and displaying treatment planning information to a user based on the scores, wherein the treatment planning information includes an identification of at least one of implant tools or a type of medical lead saved in a database as suggested to be used to locate an electrode of the medical lead at the corresponding stimulus site.