I know there is a 'Previous Preset' shortcut but I can't find a 'Previous' or 'Last Tool' used. Is there a similar option for the 'Tools' docker?

No, you can find all existing shortcuts in the configure shortcuts menu.

could you explain in a little more detail with how you are working. There are different types of tools, so the answer could be different depending on you are working.

Why would adding this help? Is there much of a speed difference if you are selecting a previous tool from a docker, selecting it from the toolbox/toolbar/menu, or any other existing way.

sure thing. I currently have a button on my Intuous tablet which I named 'Last Tool' (I was thinking of brushes as tools) that is mapped to the 'Previous Preset'. The project I am on now requires a lot of "select and fill" so I was hoping to use the workflow of grabbing the Polygonal Selection Tool and then the Fill tool and then using the "Last Tool button on my tablet just swap between them as I selected an area, filled it and selected again. That way I wouldn't have to move my hand up to the keyboard for the shortcuts or keep moving the cursor back to the tool box.

Hope that made sense....

That doesn't exist at the moment, I think.

I think the best option right now is to assign those tools to shortcuts. Then map those shortcut keys to the intuos.