Indeed this key is non standard. Other sets do not include that key and i am forced to use + key from numpad which is ok.
Since this is my project this key is included in the base kit (like it was done in all my projects before).
Alright, thanks for the explanation, I'll keep this in mind moving forward. This also explains why I found an extra 1u Code key when I was sorting my GMK Yuri set the other day
Seeing as that key is staying, and that you don't want to add too many new keys, I'd like to propose adding a single R4 “any key” again (sorry if I sound like a broken record). Together with the R3 Code, this would be able to replace R3 PgUp, R4 PgDn for those of us who need these keys (Fn would not work here). The legend could be anything generic, but Any, Meta, Salt, or even another Code would work well. I personally think Bone would be pretty cool, but that involves creating a new mold, so it's probably a no-go for such a small change. This R4 “any key” could also serve as an Fn2 key for HHKB layouts like the M60-A default one. There's probably a few other, more obscure use cases for it that I can't think of right now, but I think just PgUp, PgDn on its own makes it worth it. Thing is, Nines didn't have these R3, R4 keys either, which sucks. I'd really like to be able to use one of my favorite colorways on my favorite layout and cover it “properly”.
It's okay if you decide not to include this key, but please give it another think over
By the way, I just noticed that there is a R3 1u '" key in the 40% kit. Seeing as this is a two-tone set, that key is practically a duplicate of the '" key in the base kit, so it doesn't serve any practical purpose as far as I can tell. Remove it?