Sorry if this is the wrong place to put this. This isn't, like, a 100% serious suggestion or whatnot, I just had this shitty idea after watching Summoning Salt all day.
So, LSPDFR. It's an open world police simulator. Unlike GTA V, there's no plot or goal to LSPDFR; you just chase and arrest peds. So it's impossible to speedrun by its inherent nature, right?
Anyways, hear me out:
So, you install a relatively popular, supported, and functioning callout pack. Then you hop in game and start forcing those callouts in any order, the goal being to complete all of the callouts in the pack in the fastest time possible. There'd be different strategies for these too, such as "standard%" (complete the callout the way it's meant to be finished), "lethal%" (complete using only lethal force), "pacifist%" (complete using only less-lethal force, any kill is an immediate fail), and probably even "force%" (force end all the callouts as fast as you can; hey, there's literally a Minecraft speedrun category for dyeing sheep certain colors).
Obviously, these wouldn't ever become formal speedruns. Different mods can interfere with certain functionalities, and even something like having StopThePed or a slightly newer version of a specific callout pack or LSPDFR would probably require a whole new category. Plus, having to manage all the runs and whatnot, even with magically streamlined categories, would be a nightmare.
But I think the idea of an informal LSPDFR "speedrun" would be fun, to get through callouts like that quickly and efficiently. It'd be unique, at the very least.