I would add in an add-a-ball feature (the manual indicates the question mark target would add-a-ball in blackout mode, but it doesn't. Guess that was pre-production code ...) on blackout, and probably the other multi-ball modes as well. I'd have it be something a little more in-depth though, like several melt down hits then extra ball target, etc.

I'd add a grace period for ball saver, and bigger shots like the jackpots.

I think I'd have the modes not selectable via the mode select button. But I wouldn't want a set pattern either. Maybe the advance crime scene target could cycle next mode that was lit to start.

Physical wise, better lighting is needed for sure. Remove deadworld and add another more directly interactive toy. I would replace the air raid shot/mechanism somehow - maybe with a rotating cannon to shoot the blinking drop from the same area, air raid just feels useless as-is.