Would it be okay if I did a PSP Metal Slug 3 (Anthology) speedrun that's Low% Hard (default pistol only), but with autofire allowed? Could be its own stand-alone category. :)

It's an option in-game after all, and let's be real here, furiously pressing the fire button with the pistol is very annoying. Not impossible to do of course, but I'd rather not have to replace my controller more often than needed from wearing out the fire button, and it's also tiresome on your thumbs during practice runs. lol

P.S. I'd like to do the same exact category idea for Metal Slug X and Metal Slug 6, if it's okay as well?

I don't really see how it's possible to do Low% in Metal Slug 3, especially in final mission where you can get many Rockets , Machine Gun and Shotguns (in the space).

Moreover, you have always a Machine Gun when you use a continue on no anthology Metal Slug versions (no pistol only so) and Low% would be a category where you die a lot...

For me , Any% , No Death, No Bombs and All POWs (if no exceptionally rare POWs appareance) are the only universal and seperate categories in Metal Slug.

By the way, as you say you're playing on a controller, the filter system to see on what support plays someone was interesting like what I see on SRC of Super Metroid