The most obvious advantage of digital DJing (creatively rather than practically) is the ability to play any audio you like. Not being restricted to what is available on vinyl blows the doors wide open. Want to play the dialogue from the diner robbery intro from Pulp Fiction? No problem. Sampled the Street Fighter theme? Stick it on!
Most of the popular DJing software developers have already cottoned on to this and even provide dedicated sample players built in. Setting two decks up for regular mixing and having two for samples and loops is fast becoming the default configuration for many.
If you've dabbled with the octopus method, then the battle setup should prove a logical progression. Time now to plunder your movie collection, vinyl, CDs and the great wide world to build a collection of killer samples for select use in your sets. No need for adding stickers to records or clunky additional hardware.