An actually good open-world Shadowrun MMO. I want to be able to log in, wander around the street, get some noodles, hop on my modified motorcycle to the airport and fly around in my helicopter, land on the roof of my safehouse, hit up some friends to go on a run with me, do legwork, plan the run with shared annotated maps, do the run in whatever way we want, do the post-run stuff selling the paydata etc. which probably leads to more runs, head to the bar to watch the distorted news of my run on the 11:00 news.
I want a rigger in a van controlling a bunch of drones from almost outside the action zone. He should be able to stick anything he wants in the drone and the drone can use it. For example, the game designers don't need to think of it and include a kit to let the drone do electronics build/repair - just let me stick the normal handheld electronics toolkit on the drone and it just works.
A mechanic should be able to apply all kinds of modifications to vehicles. If I want a tiny helicopter that's specialized to carry several dudes hanging from the skids, and has almost nothing else on it, just let me make that in the robust vehicle assembly tool. If I want a van with a cybersurgery shop in the back, nothing should stop me from doing that. If I want to build an El Camino with a drone bay in the back or just one huge bomb that should be doable without the game designers specifically trying to make those as specific options.
I want a magician to be able to have weird magical adventures that nobody else has anything to do with. He should be able to scout everything astrally unless there are astrally-aware defenders. Summoning and commanding elementals and spirits, creating magical foci and binding them, initiation with magical groups (and being able to create player-run magical groups!), etc. Just include everything.
I want a decker to be able to have weird Matrix adventures that nobody else has anything to do with. He should be able to jack in from anywhere and provide support on a run, activating elevators, controlling lights and security doors, turning the facility's defenses on itself, confounding guard responses, spreading misinformation, and stealing data. However, some runs should require the decker to arrive on-scene to perform some operation on computers disconnected from the Matrix.
Contacts should be PC and NPC - that is, players can get you what you need but AI contacts can too if you have the right relationship. Better social skills get you more info and expand the list of stuff available to buy, and improve the nuyen you get from selling loot.
Have the player community create shadowruns and story chains. They can be tested on a test server by others in the community and by the company, so that high quality content can rise to the top and get proper attention. After it's vetted just stick it in the game. No reason why the developers should continue crafting runs unless they're showing off things not addressed by the community - and I seriously doubt that would ever happen.
I want players to be able to do their own thing. If somebody wants to enjoy the skateboarding physics and basically just play some Tony Hawk, go right ahead. If someone wants to set up a compound in the Barrens and recruit gang members, the tools need to be there. If somebody just wants to surreptitiously go around planting trees or recording devices or bombs or spray tags, that should be available.
I'm going to want this game until the day I die because nobody will ever do it.