Saving to Color Palette?
 

Is there a way to save user added colors to the color palette without constantly having to re-input them every session?

You might want to be more specific... where are you entering the custom colors? Are you talking about the styles under "Preferences | Manage Styles" or something else?

I have encountered this with table shading. I've resorted to writing down the palette codes for the shades I wanted or prebuilding the tables in Excel. This would be helpful but not urgent.