While it isn’t true for all ROM types, ROMs of certain game systems store sprites in uniform format which allows easy sprite hacks with tools like YYCHR as long as you don’t need to change the palette (then you need to disassemble the rom and figure out where the palette is stored). I’d like to be able to open these ROM files directly in PM as while YYCHR is a workable solution, it isn’t most easy to use. It’d need some import options so you won’t accidentally overwrite the code (represented in the ROM if displayed as graphics as noise-like pattern) to set first/last offset of graphics data which may be different in various ROM files (there should be a little preview window of area around end offset and initial offset so it is easy to set the offsets properly if you don’t know these by heart) and same for export so it can be exported as IPS and integrated with a rom using a standard IPS patcher.