So I was hoping for a better solution, preferrably the solution that used to exist in the paragraph layout dialog.One possibility would be to define a new Layout style that includes a leading space. Then you could mark and change a number of paragraphs the old way (nearly, as you would use the Layouts drop-down box instead of the Edit>Paragraph dialogue).
That would be the LyX way: Semantic markup. Doing this kind of thing will be a lot easier in 1.6. rh