Work on crazy stuff like 360 entries and all that.
I do them in RWD's all the time, they're actually quite easy once you know how, add me and I'll show you
On 4wd's, you can't remove the power from the front completely, so my logic is, take advantage of the power to the front wheels and make something that is crazy fun, oversteers hugely, and gives you something different to drive when you have spent week drifting FR cars.
I slide with 4WD's (note I don't use the word drift) and I find it's actually better to go for a 30/70 power split and then tune the chassis for crazy oversteer, then you have the possibility to do all the crazy Ken Block stuff like full on backwards entries and then using the 4wd to pull you out of it.
I've only got one 'gymkhana car at the moment, the older premium Mitsubishi Evo (IV or V or whatever it is), but I'll grab a scoobie and see what I can do with it. I can make it slide savagely and be huge fun, but it won't be anything like a RWD car.
Also, Indy Road has a fair bit of excess tarmac run off in a lot of places, and also has a fair few moveable markers, which can make for setting up a pretty cool gymkhana course.