On a stockman in particular, make sure there's room for the blade to close properly after bending a blade. Many (or most) stockman patterns with 3 or 4 blades on 2 springs will have crinked blades (often the sheepsfoot) to allow them to fit into the handle and/or between the other blades. Sometimes the spacing is pretty tight. If a crinked blade is 'straightened' too much, it might not fit anymore. With just the tip of the sheepsfoot being bent a bit, I'd assume that might not be an issue, if you ONLY straighten the tip itself, and don't alter the bend/crink behind the tip at all. Just be sure you've got room on either side of the blade to work with, before diving in...
David