Hi! I wanted to make my own bobbers and rods for compat, but the mod's minigame modifiers seem hardcoded. For want of not having to write a mixin, would it be possible to get API support?

You shouldn't need a mixin because I've added some features recently to make adding custom bobbers easier. I haven't made docs yet though. You can add your bobbers to the bobbers tag and as for giving bobbers and rods special effects, you can create a file at stardew_fishing/kinigame_modifiers.json. If you check the source you can see an example of this. Let me know if you have any other questions.