RM7 allows this but RM8 does not. I am mainly Swedish and need ÅåÄäÖö to the point that I bought a gaming keyboard and programmed this characters into the G keys. It’s been working great for me until now.
Character maps and copy/paste cannot be automated. The only other option - which I haven’t tested yet - is to switch to a Swedish keyboard layout but that messes with the position of other keys and is difficult to make the transition.
I don’t know what is involved in allowing these characters to be added from the keyboard, but PLEASE do it. This is a real problem for me. Your handling of these characters in lists/indexes even in RM7 left much to be desired.