I don't get it; first of all, you can't force someone to make him/her type a command for you. If (s)he wanted to, (s)he will type them by themselves.
(Unless I missed something here. As far as I remembered native Bukkit can't do that.)
Actually you can. But I have over 50 pages of /help and I tried google. Trust me, google dosnt know everything, especially when it comes to the details of a video game.
Besides, when your with someone, and theyre stoned out of their mind, and you want them to use a specific voxelsniper brush, its almost impossible. Its easier to tell them to just cruise around holding the right mouse button then explain something to them.