I've created a custom radial menu for using vocalize commands based on the guide given here. Please don't use it for spamming and annoy the shit out of your teammates.

VPK File

This goes into your <Left 4 Dead 2>\left4dead2\addons folder.

autoexec.cfg

This goes into your <Left 4 Dead 2>\left4dead2\cfg folder.

C - Warnings

A few are missing (especially the jockey, charger & spitter alerts).

G - Individual Player Commands

To be used after selecting the appropriate character that you have on screen.

H - Toggle Player

(Press the console key each time after pressing H to see which character is selected. Alternatively, you can use the number keys for the same.

7 - Coach

8 - Ellis

9 - Nick

0 - Rochelle

If you want to change the assigned keys, edit the autoexec.cfg with notepad and replace the bind commands with a key of your choice.

This list contains only those taunts which I liked better than the rest. You can find the complete list of commands here. Follow the guide given in the website to make your own menus if you so desire.