I would like to be able to choose the default color used when opening a new document.
I use a lot of one color for business needs. It would help me out a lot if InDesign would default to that color for text and tables when opening a new document.
You can do that! With no document open just adjust anything as you wish. In your case go to window/color/swatches and add colors manually or even load swatches from another indd. Next hit Alt+Cmd+6 to reveal the control panel and choose your desired default color.