Hi, I might be interested in your game. I played a little SR 3 and, before that, I played Shadowrun 2.01 religiously, though I am unfamiliar with the rules of SR4.
You didn't say much about what kind of setting you plan to use, except that it will be a bit darker and kinkier than the whitewashed version they sell to the kids. I suppose, Shadowrun has a lot of dark areas already, only the usual stories don't take place in them. Some ideas:
I would be interested in your 'darker, edgier and kinkier' take on corporate life. Even though Shadowrun usually features fighters from the gutter of society, trampled on but standing proud, wouldn't it be interesting to see the other side? A corporate 'problem solver', a subdivisions go-to man for the dirty work would make for an interesting character. In my mind, a Mr. Johnson who has to decend from the glittering towers and negotiate with Shadowrunners and their ilk, is as much a warrior as the men and women he hires. And yet, in the eyes of the common man, he is without honor, a cog in the machine of exploitation and corruption. And, quite possibly, they are not even wrong. I imagine him to be immensely yaded with what he has seen - and paid to be done - down on the streets below the glittering lights. He is probably a man of dark desires. And yet, most of his days are spent in a nice, brightly lit corner office or in the tranquility of his loft. One does wonder how much his secretary knows - or gets to feel - of the darkness he conceals underneath his spotless white shirt and fashionable business suit? When your boss has an untraceable 'black-ops' account and free access to illegal goods, services and cyberware, just how personal does Personal Assistant become?
Speaking of yaded, the average trideo viewer today is nothing but. Naked news anchors, gladiator shows, live suicides, it rarely evokes more excitement than a yawn. Enter the Shadowdolls, an all-female group of shadowrunners, wired with life senselink rigs to give the viewer the closest possible experience of their exciting, dangerous life. "See what they see, hear what they hear, feel what they feel!" Is the slogan, and they feel a lot. Pain, fear, adrenaline, excitement. Not to mention all the lust, jealousy and cattyness during downtime in their hideout from the hormonal adjustments they secretly got when they were under to get the senselink equipment installed...
Granted, the second one is more an idea for a group game but I had it already in my mind when I stumbled across your offer to GM and I thought I would propose it as well.