Consider applying the exponential back-off technique. Originally designed for firewalls, it works well with annoying people! (particularly Slack etc. with faster rates than below.) This only really applies when you owe people an answer, so I'm not even sure this applies here. You could simply palm them off politely. Here is how it works. Silly request 1: respond within the hour silly request 2: respond within a few h…
You'll become "the guy who doesn't respond to GitHub issues" and that is going to backfire on you because commercial software, or other projects, or prosoective employers are going to be coming and saying "you see, this open-source software is not or poorly maintained" I recommend on saying "Thanks for sharing the idea" Once you have time to work on your project, then you create a new sprint based on a couple of idea…
I fail to see how it would be a bad thing.