If you are in the project tree, F3 adds actions within the project you are in and F4 adds sub-projects. The focus is automatically on the action or project's description so that you can enter them. This allows a very fast entry of your project planning.
F5 is very useful when reviewing your planning. It swaps the focus between the tree panel and the action/project panel. When the focus gets to the action/project panel, press Tab to get to the Description field.
F6 allows you to enter a thought from any screen within ThinkingRock.
A demo is available showing these keys and how to change the mapping.