I'm a keyboard player who uses a sayodevice O3C, a keypad with configurable rapid trigger. I use it primarily to shoot fast because I use the same hand for jumping and shooting, and jittering is hurting my hand on my current keyswitches.

On one hand I feel like it should be fine because it's not a big advantage compared to a mechanical keyboard; you still have to press, release the key and master your technique. But at the same time you can put some ridiculously low RT range settings so that even the slighest touch registers as multiple inputs. I really want it to be allowed but I get that putting restrictions on specific settings is much harder than simply ban this type of keyboards.