I think that any more detail you put into the definition just makes it so.... For example, did we miss anything? The only reason I was suggesting that you could put it in through the regulations is that, first, there is a regs-making power in there, so you have the ability to do that. What the regulation-making does is provide further opportunity for consultation on that, if there is a desire to further define.
There may be a desire to go beyond that in terms of being able to further specify what the different behaviours are, but if it's the will of the committee to put that in, it certainly doesn't cause trouble to the legislation itself.