multiple premoves when

multiple premoves when? discuss

Never.

Today.
If not, read the top line again tomorrow.

Serious answer:
I don't know. But I see no reason to change the current premove situation.

Multi-premoves have been already invented. Keyboard: github.com/Sentero-esp12/Lichess-Keyboard-Input Keyboard + multiple premoves: github.com/Sentero-esp12/Multi-Premoves-Mouse-Keyboard

You can do multiple pre moves in chess.com

But this is Lichess!