It would be nice if you were able to send messages to a player while they were offline, that way you could let them know something without having to wait for them to be online.
Yeah good idea, but if someone felt like spamming you, you would log into the game and find alot of messages xD.
I think you should be able to do this also. To often someone leaves and you didn't get your message through.
You mean like, if you send a message to the person and unfriend him, he still should be able to see it?