Now, when you have a drawing-object, then in the format-area dialog you can
load, alter and save the palettes for colors(soc),gradients(sog), hatching(soh)
and bitmaps(sob). I think, that it is no good place.

Imaging you are in Calc and you will define an own color for a cell-background.
Now you have to draw a rectangle, go to the format-area dialog of the rectangle,
define your color, then delete the rectangle and then you can use the new color
for your cell background. The same thing in writer: Defining a new color for
font or background can only be done by a temporary draw object. That's not
intuitive. So people think, that defining new colors is impossible, see the
issues 11098, 16217 and 20105.
Another reason for a separate dialog is the fact, that the changes, which will
be made in the format-area dialog, will not only change the color of this
special draw object, but will change the available colors for all further using
of colors in that document. Such far-reaching changes should not be made in a
place, where each other thing is a hard formating of a single object.

I propose to make a new dialog "alter palettes" and place it into the Tools-menu
so that it is available without any draw-object, but continues being specific to
each document.