Yes, but why would you do that and create a huge TIFF file if all you needed was to edit in Lightroom?
I have a few files (e.g. ISO 200) which suffer from pattern noise in the deep shadows when I lift them with fill light - typically a scene with a very wide range from bright highlights to deep shadows. DPP seems to suppress this even before carrying out any actions, so I just wanted to take advantage of this aspect of DPP alone. ACR/PS doesn't deal with the pattern that well so far as I can see - i could try TOPAZ, I suppose.
Obviously you can't start on a raw file in DPP and then open it in ACR, so I thought LR might be the solution. I did actually get LR3 when Amazon halved the price a while back (little did I know LR4 ws coming at an even lower price!) but haven't really used it as I haven't got my head round the import/catalogue side of things yet.