sos and nc are currently not accurately recreated, just press 'R', and you will respawn in last checkpoint, with your vehicle.
vr is /repair and a button in new f1 menu.
and btw im making the ax friendly commands right now
also, al these functions will have a keybind.
if you need to make a keybind out of any command, just write
/bind key state commandname arguments
key - valid key/control name, see
http://wiki.multitheftauto.com/wiki/Key_names and
http://wiki.multitheftauto.com/wiki/Control_names control is particular gta function bound to any amount of keys, and key is just particular button
state - when to trigger, when button gets pressed, released, or both. valid types are 'down', 'up' and 'both'. in most cases just use up.
commandname - pretty straightforward
arguments - arguments for the specified command above
you should get info about successful/unsuccessful binds in f8 console.
to unbind keys you can use /unbind key
also, while you are connected to server you can use default binds tab in main menu/settings to manage your binds.