I was wondering about that when I read the OP's question. Lightroom allows virtual copies, but the only way that I know in Lightroom to have a 1234.dng AND a 1234.dng-1 within the Lightroom library would be to export out the original file as 1234.dng-1 and then reimport it as a separate file. Then again, I'm no Lightroom expert... If you do an edit in Photoshop for example then it adds an '-edit' to the original. Is this what you meant?
Perhaps you guys are right. As I said I am no expert in LR. However, one of the advantages of LR is that it is lossless and you never lose the original. However when I do an edit I do lose the original unless I "reset" the edits, then i have lost the edited file. That doesn't seem to make sense to me. Any thoughts?