w/ and /w get messed up a lot. Especially if you type fast and with all your fingers, it's quite easy to mess up.
I've seen witches accidentally outting themselves to the town, towns whispering important info to the jailor. Happened to me a couple of times too when I've been typing too quickly.
I think it would be good if either you needed to push a button to whisper a player, or if w/ would just not work.