While watching the great 39th Kisei title game 2 at https://online-go.com/review/49719 I shared a variation. I noticed that I have come accustomed at keyboard shortcut CTRL-ENTER for sending stuff. It could be used for variation sharing keyboard shortcut, as plain ENTER would be problematic with many unintentional shares(and is thankfully not used currently).
Currently if I make a variation and type a name for it, I have to use mouse to share it. Quite cumbersome but still acceptable as shared variations are “cluttering” the chat a bit so maybe it’s a good idea to keep them to a minimum (with a design that forces people to spend effort)