I think if your going to play looped based techno then you have to mess around with it, I find it keeps it much more interesting and gives it that bit more energy. When I look up at a DJ behind the decks and he's all over them it just makes me want to dance more. But yeah its got to be good tunes and not to much of the same thing, bit of a DJ ying and yang... a good balance!
Dave Clarke played here in Dublin years ago in a small club called the Kitchen (before he was huge) and he ripped it up with double copys, scrathing etc etc, the man was on fire, why he gave this up I'll never know?