I believe i know why the game automaticly kills your 5th and 6th party member ... Since our party just spawns on that raft dont walk there on their positions, the game *most likely* just dont know what to do with others, since Larian created only 4 solid spawning points ... so it deals with them as if they would fallen.
Therefore fix will be for moders quite easy, but problems like this have to be find first.
Right now, we only altern one number ... that is hardly sufficient for fully working mod.
If my comments bother you, there is nothing easier than telling me to stop. I mean ... I won't ... but it's easy to say.