I started to add amateur radio repeaters to OSM and in first place used key "tone" to assign required CTCSS tone to open the repeater. But then I found that the key meaning is tone_burst, so commonly 1750 Hz. I guessed the key "tone" is misleading and I changed it to toneburst.
As I mostly added all amateur repeaters on OSM (except of six repeaters in Europe) I will change all my edits from key "tone" to "ctcss". I also will take care to the European repeaters to make required changes. Presently it's not too much work.
I hope you agree on my decision.