• Registry Explorer

From author's site:

Vilma ® Software Registry Explorer is a powerful tool that will give to you the easiest way to rule all aspects of your system. You can create new keys and values, add them to the registry, or delete the existing ones.

You don't have to make a backup of all your actions as Registry Explorer does it in the background. If you decide that an action is not useful, or is wrong, just open the "Backup" window and restore the item by clicking over the record. Importing and exporting data files is very easy.