Hey cristiano, i have another suggestion:
Why not put all leagues, teams (NT areas, europe Club teams etc) with bins and images into separate folders (one folder for a complete league or NT area) ?
PES searches through all folders in WEPES.
This way it would be easier, if someone for example wants to import just a few files or specific leagues or teams. If all bins are in one folder, they are sorted alphabeticly. If you put them into different folders, they will be sorted according to the folders, which means that all league teams that belong to same league or national teams from the same area will be direct row (as well sorted alphabeticly, but just for the folder).