Admin users can edit 'Color Schemes' by the key Theme_Customizing_Key beside the color scheme drop-down. The following snapshot shows the location of this key in the Setting Form and 'Theme Customizing Form' as well:








 In this form Admin user can edit any existing Theme or create any new customized one. In this form all colored item can be selected form Color common dialog like below:

and for other numerical setting, there is  key that describe all available numbers for that setting, for example for the Shape value on the Tab Settings, user can choose one of the followings:

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