To create a tool to use each time you want to markup a document with a variety of tools is painful. That’s why you have a Favorites Bar that is unique to the user and not to the document.
The tools you create with the current tool widget can be easily saved to your Favorites Bar and carried across to each document on every one of your active projects. It doesn’t matter if you have 4 tools or 100 tools, the Favorites Bar can contain as many tools as you need.