Apparently,you must change the file Player1.PLR(documents/my games/Simbin/RRE/userdata/Player1).
In this file,you can write messages that will be used to say Thank you, Sorry it's my fault,.....
This file is encrypted.I wasn't able to open it with Notepad or Wordpad.
To use "quick chat",you must have a keyboard with macro keys(gaming keyboard). http://gaming.logitech.com/en-gb/gaming-keyboards
With keyboard software,you can configure programmable keys(enter a text...).