Snarfblam, the creator of the widely-known Editroid program used for making custom NES Metroid terrain, released a new patch for the classic title known as “Metroid Plus” on the Metroid Database. It adds new features in newer Metroid games back into the original, like a map on the start screen, a status screen at the load menu, and even a long awaited saving system, plus a few other bonuses!
If you like fiddling with rom hacks, then this is a great patch to try out. You can download it here or head to the MetroidDatabase post about it and download it there. Note that you’ll need a patching program like LunarIPS to apply the patch onto your rom.