Alright I figured it out. For the key Q, it is number 81
So you have your controls from your ELS.ini file 81 is Q. What you have to do is, change ToggleSirens = 71 // G by default to ToggleSirens = 81 // Q by default
[ CONTROLS ]
ToggleLightsPri = 74 // J by default
ToggleLightsSec = 75 // K by default
ToggleLightsWrn = 76 // L by default
BrowseModePri = 85 // U by default -- Info. panel must be toggled on for effect
BrowseModeSec = 73 // I by default -- Info. panel must be toggled on for effect
BrowseModeWrn = 79 // O by default -- Info. panel must be toggled on for effect
ToggleInfoPanel = 77 // M by default -- Alt key must be pressed as well
ToggleAutoMode = 84 // T by default -- Alt key must be pressed as well
ToggleHazLights = 89 // Y by default -- Alt key must be pressed as well
ToggleSirens = 71 // G by default