I have seen suits with the smashed-flat looking three button stance that were successfully pressed out to at least roll more smoothly to the second button. I don't think (though I disclaim all liability) that you would wreck it by pressing the underside of the lapel out flat over the top buttonhole and seeing whether it will roll down lower. It depends on the construction inside the lapel, though, as some suits are made with very well defined rolls, actually more of a fold, whereas some are made with a very natural roll, etc. Is there pad stitching (little pick stitches) under the whole lapel, just in a line along the roll, or not at all? Are the lapels fused or canvassed? Please excuse stream-of-consciousness reply, can't stop sneezing to edit.