Not sure if you could do this, but i had a really good idea about talking signs.
Sounds weird, but hear me out.
You join in on a server, and instead of reading the words on the sign, you right click it, and a voice recording starts talking. (Almost like the messaging system on Xbox!)
Basically, you put the sign down, hit record, and say something for like a max of 10 sec. Then, people can listen to your voice giving them directions or rules or whatever.
I have absolutely no idea how you would do this, just an idea.
