Someone should write a decent windows 7/10 snestool to edit headers/convert format/convert ntsc<->pal and vica versa/ etc...
[EDIT]
I know there's SFC/SNES Rom Utility, but it has less options then snestool
(Yes, most don't need all the extra, but i still use a copier on my snes)
for waht need you the tool?
patching between ntsc - Pal? you need a ips file for it. a spezifik or a lorom or hirom patch.
remove header?
split file?
with ips files you can make everything