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For that matter, I still don't understand why the base kit has one (1) 1.5U "AltGr" key, even though this kit has otherwise no support for anything other than US English on ANSI (and the corresponding 1.25U key in the same kit is "Alt", not "AltGr").
(also, R3 \| on the addition kit, yadda yadda yadda)
The Alt GR key is just a nod to the original, it isn't on the 1.25u key cause it kinda looks too cramped there. It was this way in R2 too.
If it's a conscious design decision and not simply an oversight, then it's no problem. I still find it weird, though (I'm trying to see this through the eyes of a user who's not aware of 9009's history).
Also not sure what you mean with R3 \| key in the addition kit? We added full ISO support a while back. The \| key pictured next to the shift is R4
The base kit provides full US English (national layout) on a (physical) "ANSI" keyboard (2.25U left Shift; horizontal Enter).
The addition kit provides the needed keys to support UK English (national layout) on a (physical) "ISO" keyboard (1.25U left Shift + extra alpha; vertical Enter).
If one wanted to have a
US English national layout on a keyboard with a vertical Enter (either an "ISO" physical layout as above, or an "ANSISO" hybrid
(2.25 left Shift; vertical Enter)), an arrangement common in terminal keyboards, the R2 1.5U \| key would need to be replaced by an R3 1.0 \| key... which is not present on either kit, forcing the user to use another key (typically #~, from the UK set), which is wrong (or "less than ideal").
There's more to this, but I don't want to risk derailing the thread over a minor issue. I'll tell you over a PM if you want to read about it.