...to say nothing about the hidden option: USE_PRE_WILDFIRE_ENTITY_COLOR YES in the SCL file
...for which I never received an acceptable response from CS when I inquired as to its meaning.
This was the configuration I ended up with after a lot of research:
CUSTOM.SCL file
COLOR_SCHEME 0
USE_PRE_WILDFIRE_ENTITY_COLOR YES
SYSTEM_DIMMED_MENU_COLOR 57.8125 57.8125 59.765625
SYSTEM_LETTER_COLOR 100.0 79.6875 19.921875
SYSTEM_HIGHLIGHT_COLOR 39.84375 7.8125 7.8125
SYSTEM_EDGE_HIGH_COLOR 100.0 14.84375 14.84375
SYSTEM_GEOMETRY_COLOR 94.53125 94.53125 97.65625
SYSTEM_HIDDEN_COLOR 75.78125 75.78125 79.6875
SYSTEM_SHEETMETAL_COLOR 7.8125 39.84375 7.8125
SYSTEM_CURVES_COLOR 19.921875 19.921875 59.765625
SYSTEM_VOLUME_COLOR 39.84375 19.921875 39.84375
SYSTEM_SECTION_COLOR 19.921875 79.6875 100.0
SYSTEM_PRESEL_HIGHLIGHT_COLOR 39.84375 100.0 19.921875
SYSTEM_SELECTED_COLOR 19.921875 79.6875 39.84375
SYSTEM_SECONDARY_SELECTED_COLOR 19.921875 79.6875 79.6875
SYSTEM_PREVIEW_GEOM_COLOR 100.0 54.6875 0.0
SYSTEM_SECONDARY_PREVIEW_COLOR 79.6875 39.84375 59.765625
SYSTEM_DATUM_COLOR 59.765625 39.84375 19.921875
SYSTEM_QUILT_COLOR 100.0 79.6875 19.921875
SYSTEM_SHADED_EDGE_COLOR 4.6875 4.6875 5.078125
SYSTEM_BACKGROUND_COLOR 0.0 0.0 19.921875
BLENDED_BACKGROUND yes
SYSTEM_TOP_BLENDING_COLOR 0.0 0.0 23.4375
SYSTEM_BOTTOM_BLENDING_COLOR 0.0 0.0 11.71875
