Im assuming its not valid, because its not listed and not on the original nes classic. But other emu's are allowed

There is no reason not to add the damageless category. Viggo spent a bunch of time on completing this and is extremely rude to just denie him of this. I dont run this but hopefully you take my opinion into account. Just put it into misc. if you really feel like. Does no harm.

In my opinion, keeping the board "clean" by not adding any more categories doesn't make any sense and there is no good reason to not allow more to be added . It will only make the board look better and grow the community and bring in new runners. A lot of people are way more interested in 100% than any %. So, I think adding new categories is a great idea and i look forward to watching people run them!