Well, the watch must be able to travel through space a bit, because Jack used it to get from Satellite 5, in orbit around the earth in 200,100, to the actual earth in 1869. Now, OK, he's immortal, so he could have just fallen to the earth's surface and survived. But he said he didn't find that out until 1892, whereas he'd probably have noticed if his arrival on earth in 1869 had involved falling from several miles above the earth's surface.

Good point about the Family of Blood, yes - they definitely needed Smith alive, didn't they?

And that's interesting about Torchwood. Yes, like you say, DW!Jack is much better than TW!Jack. But then again, TW!Jack is still pretty much the best thing in Torchwood, so I dread to think what it'll be loike if he isn't in it much. Hey-ho - it could be OK if Ianto takes over the reins, I guess.