If you want to have a single line of text when you push a button, just openylur console and do this:
bind a "say /me swigs his AR2 around from behind his back, sets the power on, and disables the safety."
Include the quotes. Now if you want to have multiple lines in a secuence, you will require a keyboard/mouse with macro programming. This is good though as you can toggle consone commands "such as +forward to walk and talk" or do a /me while performing a /anim. Ill make a guide on this subject soon.