What it would be, is a server mod where you can type in a command, (ex. /help /medic) and you would hear it from your blockhead. You could just take the audio from TF2, and set it to sound like a blockhead's saying it. You could also use keybinds, for example, you would hit a key to bring up a menu, and you would hit one of the numbers on your keypad that corresponds to your desired voice command.
Command menu 1
1. Yes
2. No
3. Help!
4. Go, go go!
5. *Battle cry*
6. Medic!
7. Incoming
8. Positive
9. Negative
0. Cancel
Who likes the idea?