I had a quick look at Heist Gone Bad the other night with the intention of using it for a crew event.
The bank works really well, no wanted level till you get in there and have to deal with the professionals and then that causing the wanted level when you leave. We only got to part 3 as my connection was playing up so trying to communicate with Chubb as we did it was very difficult.
For ages I've wanted to do an Italian Job variation as a heist type of deal. I started trying various things on PS3 but never could quite get something like I wanted it, but looking at your stuff it's given me some ideas and I think I can make it work as a Co-Op thing.
The Transform Races will hopefully be very useful as well to give the final stage, so after we escape in the Minis we can switch into a bus.
Mission Creator to make Adversary Mode or Contact Mission style jobs would be the ideal, I've quite a few ideas but I'd really like them a bit more co-op or to be able to have one guy escaping, the others chasing.
We can do it as an organised job with some planning and instructions, shame we can't have it a bit looser through more Creator options.