I have an object in my game that I don't want the player to be able to drop, which is easy to do, but it doesn't prevent them from using 'put' to place it inside a container. I don't want them to be able to leave the object behind, is there a way to fix this?

I posted about just this earlier.
http://textadventures.co.uk/forum/general/topic/er9yijag3ekdrpvj4uh-ra/dropping-stuff

If you cannot wait for version 5.7, you will need to override the PUT command. Are you using the on-line editor or off-line? It is rather easy to override a command off-line.

What a coincidence! I can wait for the next version, the game is small enough that the player can go back and pick it up, I just wondered if I was missing something! Many thanks.