Microsoft has a history for leading the way in setting standards across all their software offerings, creating consistency with file menus, buttons, short-cut keys and actions. For some reason, every other Microsoft product which allows you to create a document, spreadsheet, e-mail, report and so on, offers you the ability to undo and redo. Integration Services has long been an exception to this rule. Why? We have no idea. The good news is that this has finally been added into Integration Services 2012. Yay!
Now you can undo or redo up to 20 actions in the SSIS Designer and it is available in the Control Flow and Data Flow tabs, Parameters and Event Handlers tabs, and the Variables window. At the project level this feature isnow available in the Project Parameters window.
You are no doubt used to using Ctrl + Z and Ctrl + Y to undo and redo respectively in other Microsoft applications. You can use these, or use the menu items, or roll back or forward through selected items...