Trigger Zone is the most common DO NOT USE event you will see. To add it to your JCS, do the following:

Go into your main JJ2 folder, and open JCS.ini.
Find event 246.
Replace it with 246=Trigger Zone |+|Trigger |Trigger|Zone|TriggerID:5|onoff:1|switch:1
Save, exit.

(JCS doesn't support multiple spaces very well, so use some spaces to get all the | symbols to line up with those in other events)