I would like to see Gabi punished. Maybe Ari would be the one who gets a hold of Mommy's phone and plays with the app her Mommy is so fascinated with all the time. Ooops.
I would like to see people after the event to not have hooked up with regrettably strange pairings (As in, what if Jack was with someone else while Jen is in her coma, I don't want Gabi to be with Eli, etc)
If there are new characters on the canvas, it could be fun just seeing them without introduction as long as they're woven into storylines really well, and we can see how they showed up in flashback. Likewise for returning people (let's not have a throwaway "I came back because..." statement in the course of conversation) - if Kim and Shane were to show up, Kim is already doing something at the hospital, Shane is wherever he is. No showing up at the pub and having Roman hug them like he hasn't seen them in ages and saying "I'm so glad you came back after [incident that brought them back that we haven't seen or don't know about]"
If you're dead, stay dead. If you're sleeping with someone, you're in a relationship and not bed-hopping. If we're going to have a crime family, then let's have a crime family and not people who do random evil misdeeds for their own service (cough, Gabi, cough). If you're going to write something comedic, then do that and integrate it with light storylines and not interspersed with the heavier stuff. Humor is a good thing if it's well written and well acted, and I was hoping for some more of that with Jack and Jenn before she ended up falling over the balcony. If you're going to do sci-fi stuff, maybe not take it off the rails (I love Dr Rolf, but I'd love to see him a little less kooky and over-the-top in that 1940s twirling mustache sort of way - also, you're not Phil the homeless bum on 'Night Court' anymore, so don't get manic either).
If you're going to have a relationship storyline, how about letting it be happy and boring - we see you together, we're ok that you're together, there aren't things every 10 minutes trying to tear you apart.
We're not stupid viewers, we can figure some stuff out for ourselves without being whapped over the head with a rock so write better.