The lack of soft proofing is LR 2.0 is a serious failing, but not a show stopper.
The thing to keep in mind is that the need for soft proofing is only there when an image has out of gamut colors. Otherwise just stick to Relative and be done with it.
If you're printing to matte papers then this is going to be an almost constant issue, and in that case I would export to Photoshop, soft proof and usually print directly from there.
But, if you print with the new generation of quality papers that use photo black ink, (as I do), they have a much wider gamut, making the need for soft proofing necessary much less often. After a while you get to know your images and paper and ink, and will be able to tell when a particular image is going to be a problem, without having to pop into Photoshop to check it.
Michael