[Betamaster]

GXT info

Mappings
~1~ numeric parameter
~a~ area title
~k~ key definition
~b~ person's name (like 'Sweet')
~h~ text highlight
~r~ failure message
~s~ order text (do that and that)
~w~ dark gray (default)
~x~ menu command
~y~ place title (like 'someone's pizza)
~z~ white color

Keys (on foot):
left/right ~GO_LEFT~, ~GO_RIGHT~
forward/backward ~GO_FORWARD~, ~GO_BACK~
special ctrl left/right ~VEHICLE_LOOKLEFT~, ~VEHICLE_LOOKRIGHT
special ctrl up/down
action ~PED_ANSWER_PHONE~
previous weapon/zoom in ~PED_CYCLE_WEAPON_LEFT~, ~PED_SNIPER_ZOOM_IN~
aim weapon ~PED_LOCK_TARGET~
next weapon/zoom out ~PED_CYCLE_WEAPON_RIGHT~, ~PED_SNIPER_ZOOM_OUT~
Group CTRL Forward ~GROUP_CONTROL_FWD~
Group CTRL back ~GROUP_CONTROL_BWD~
conversation - no ~CONVERSATION_NO~
conversation - yes ~CONVERSATION_YES~
change camera ~CAMERA_CHANGE_VIEW_ALL_SITUATIONS~
jump ~PED_JUMPING~
enter vehicle ~VEHICLE_ENTER_EXIT~
sprint ~PED_SPRINT~
fire ~PED_FIREWEAPON~, ~PED_FIREWEAPON_ALT
crouch ~PED_DUCK~
look behind ~PED_LOOKBEHIND~
LALT Sneak ~SNEAK_ABOUT~

Keys (in vehicle):
left/right ~VEHICLE_STEERLEFT~, ~VEHICLE_STEERRIGHT~
steer back/up ~VEHICLE_STEERUP~, ~VEHICLE_STEERDOWN~
Special ctrl left/right ~VEHICLE_TURRETLEFT~, ~VEHICLE_TURRETRIGHT~
Special control up/down ~VEHICLE_TURRETUP~, ~VEHICLE_TURRETDOWN~
secondary fire ~VEHICLE_FIREWEAPON_ALT~
look left ~VEHICLE_LOOKLEFT~
hand brake ~VEHICLE_HANDBRAKE~
look right ~VEHICLE_LOOKRIGHT~
next radio station ~VEHICLE_RADIO_STATION_UP~
previous radio station ~VEHICLE_RADIO_STATION_DOWN~
No ~CONVERSATION_NO~
Yes / Trip skip ~CONVERSATION_YES~
camera ~CAMERA_CHANGE_VIEW_ALL_SITUATIONS~
brake/reserve ~VEHICLE_BRAKE~
ENTER+EXIT ~VEHICLE_ENTER_EXIT~
accelerate ~VEHICLE_ACCELERATE~
fire ~VEHICLE_FIREWEAPON~, ~VEHICLE_FIREWEAPON_ALT~
horn ~VEHICLE_HORN~
submission ~TOGGLE_SUBMISSIONS~
RMB vehicle mouse look ~VEHICLE_MOUSELOOK~

It would be nice if someone mapped the ~k~ definitions to the keypress constants in 0.2 (like KEY_ACTION).

Some of the above info was collated from www.gtaforums.com.