_user_account

Yeah, it sucks.

This adds ~1ms latency per transfer cycle for rapid bidirectional communication which leads to half the USB 1.1 speed for smaller packets at best.

Still, I don't think this patch should be applied /for everyone/. Maybe compile out-of-tree and load as a kernel module, if possible?

That makes no sense, coding harness are just subprocess wrappers + http calls. What is the benefit if at the end of the day it will spawn make,cmake,python,node.js, or whatever the developer is working on? With the enormous downside of loosing native/easy extensibility, JavaScript Object Notation (JSON) is derived from JavaScript, it seamlessly parses and dumps.