Morrowind came with the CS on a disk - with Oblivion, the CS was available online before the actual game.
I don't see the problem with an online download.
they should be focusing on the game when they are releasing not the modding tools
Releasing a CS (CK just sounds so awkward :cryvaultboy:) doesn't impact the development of the game at all. Its the same tools they use to make the game, so all they have to do is upload them online.