He is not referring to the LCPDFR lightning modes, but the ELS ones..
You should just change the key ELS and LCPDFR bindings to be different from one another in order not to trigger the ambulance response:
- Either change ELS bindings to ALT+E instead of current Ctrl+E OR
- Change LCPDFR ambulance hotkey to Ctrl+E instead of current ALT+E
As for the crashing...you probably have a modded Ambulance model, which overhelms the system, causing a crash...
EDIT: why wouldnt they work properly with ELS 7? The models are essentially configured in the same way, because both v7 and v6 use the same extras for the same functions (1,2,3,4 - primary lights; 5,6 - takedown;, 7,8,9 - secondary)..the code is just `a bit´ different.