We have just added a chrome extension on the chrome app store which in effect, replaces the bookmarklet and adds a "remove all annotations" function for ease of use.
You can access the outromaker functions from a menu added on your YouTube annotations interface like so:
For now, you will still need to place the playhead where the outro begins but we'll be adding the functionality to the extension as well.
We'll soon add more functionality to the extension and upload usage videos! Stay tuned!