This mod does not edit the combinator prototype in any way, this is a fully vanilla-supported feature, there's just no vanilla UI for adjusting it (yet?). Combinators with edited outputs stay edited after removing the mod, can have their settings copied to other combinators, and can be blueprinted without being flagged as modded, all while maintaining their edited constants.
Curious what exactly this mod can do and want to see it before installing? Paste this blueprint into your vanilla game, without installing the mod. https://pastebin.com/6pVVH440

yeah this mod is just a quick and dirty way to be able to edit the constant since vanilla lacks a gui, the popup input field is a really low effort method but hey it works :D