Most times when someone edits a line or polygon (moving/deleting/adding vertices) many edits are made without saving. One missed click and the editor toolbar resets to "create new feature" which will move the whole shape. Not only does it change tasks but it drops all the edits made during the modify feature editing. This combined with the fact that a user cannot undo and get their edits back can be extremely frustrating. It would be nice if you could lock modes so a missed click wouldn't change tasks or if there was a detailed editing history to get back edited vertices.