At the moment it doesn't appear to be possible to assign a key to fourth gear.
The patch below fixed the problem for me.
Code:
Index: include/carcontrolmap_local.h
===================================================================
--- include/carcontrolmap_local.h (revision 2278)
+++ include/carcontrolmap_local.h (working copy)
@@ -318,7 +318,7 @@
carinput_stringmap["first_gear"] = CARINPUT::FIRST_GEAR;
carinput_stringmap["second_gear"] = CARINPUT::SECOND_GEAR;
carinput_stringmap["third_gear"] = CARINPUT::THIRD_GEAR;
- carinput_stringmap["forth_gear"] = CARINPUT::FOURTH_GEAR;
+ carinput_stringmap["fourth_gear"] = CARINPUT::FOURTH_GEAR;
carinput_stringmap["fifth_gear"] = CARINPUT::FIFTH_GEAR;
carinput_stringmap["sixth_gear"] = CARINPUT::SIXTH_GEAR;
carinput_stringmap["reverse"] = CARINPUT::REVERSE;
Cheers
