Is there a way I can search for games alphabetically without having to hit load next 50? Let's say I wanna see the games that start with M on the NES, do I really have to hit load next 50 until I eventually get to the M's?

This'll give you any game with the letter M in it, which is not exactly what you want but it's as close as you can get right now: https://www.speedrun.com/games#platform=NES&orderby=title&title=M