The second iteration of 2v8 is now LIVE - find out more information here: https://forums.bhvr.com/dead-by-daylight/kb/articles/480-2v8-developer-update

More severe DC penalties?

Is there a reason why survivors OR killers aren't getting more severe punishments for DC'ing at the very start of the game?

I sincerely doubt anyone would even notice 5 minute penalty as sometimes game can take more to load.