Regardless of the how-to issues, I think if you believe you have to go back to lightroom for something it would indicate you need to learn more about how to use Photoshop. I can't think of any reason to go back that way - I have both and am not dissing Lightroom at all, but its editing functions are a subset of Photoshop's.
Out of curiosity, what is it that you think you want to go back to Lightroom for?
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I don't think using Lightroom after Photoshop reveals a workflow issue. I manage/catalogue all my images in Lightroom, so once I edit in Photoshop, the tiff goes back into Lightroom. When I'm ready to upload, I export as a jpg from Lightroom.
Sometimes after its been to Lightroom and back, I find something I want to fix, say a distant bird in the background that Istock will claim is a hot/dead pixel, and I'll fix it in Lightroom.
As I'm uploading some of my old istock images, I'm reprocessing some of them and I can lay my hands on all my old raw/tiff/jpgs through Lightroom in a just few seconds. I'm sure there are other ways to manage a catalogue, but this workflow has been a huge time saver for me.
