And also "filelist=" is 9 chars long.
I have some doubts why such option is even required. PackagesToLoad works only with UE3 packages / uassets, I believe something like "-pkg=internal_uasset_path_in_pak -path=path_to_paks" will not work - but if you have assets already extracted, wouldn't it be easier to reorganize them externally, like copy to a separate folder according to the filelist and then process in umodel with single -path=folder.
so -pkg= works in ue4 for me, im doing this because its a automatic pipeline for a .umap importer in unreal, i get all paths of meshes i"ll need and send them to UEViewer to extract them.