Would it be possible to add negative rows that are out of scope of the top of the smartsheet? Being able to reference formulas out of the top of the smartsheet would be useful for formula creation and maintenance when information is being added,changed, and calculated via web form. (could also be done by allowing a declaration of the level for posting when editing a Web Form, I don't know which would be easier.)
I don't trust posting at the bottom because I can never seem to control where it posts. Even when I attempt to delete or clear rows it still ends up posting at the bottom of the page. So I suppose that could be a solution as well, however it seems like the optimal, and most professional solution is to add web form posting starting at a specific row.