I really like hitting switches to light pop bumpers for more points. Someone can correct me if I'm wrong, but I just don't see this feature on modern pins. Rather, you do something to qualify super pops -- perhaps hit a mystery award or just hit the pops enough times. But, it's not the same as seeing pop bumpers that start off unlit light up for extra points. On my Special Force, the bumpers start off unlit for I believe 10 points, you then can qualify them one at a time to be lit for I believe 100 points. And, then you can qualify them again to blink for more points. And, qualifying them takes some work, as you have to hit a succession of switches.
Anyway, I was wondering what other older features aren't used that much anymore that would be cool to see again.