Yeh, I will check now if this causes problems by removing parameters 5 and 6 from JCS.ini, then making a new event with params 1-4 set, then saving, and then putting back params 5 and 6 and reloading BCCS and the level... I'll be back soon ;p

EDIT: I did:
-Removed params 5 and 6 from event 46 in JCS.ini and saved
-Loaded BCCS and Binnen.j2l and selected a random event 46 and remembered its values (didn't copypaste it)
-Created a new blank level and recreated the previously remembered event 46 in it
-Saved the level, closed BCCS and put the params back in JCS.ini
-Loaded BCCS and my blank level and checked the event I put there

Result:
Although I did not (enable me to) specify parameters 5 and 6, they had values identical to parameters 1 and 2 respectively. All 5th and 6th parameters can be taken out of the ini file =)

EDIT: Parameter 4 happened to be 'automatically set' too, so I removed that one from the ini file too.