rockered wasn't originally meant for park, it was meant for keeping the tips and tails up in the powder (depending on if you're going switch or not).
Of course, they have started to make rockered park skis. They are awesome for nose butters but I would think that the pop is terrible, because the camber is the exact opposite of what you would want for pop. The ski isn't helping you jump at all, you have to use only your mad hops to get the huge lift off the lip. With camber, the ski flexes downwards and can push up with you, rather than you having to just jump with the skis on.
Nevertheless, a pair of reno jibs (which I hear are rockered) and the hellbents would be amazing to have.