Sorry G.I. J., been away racing up North in Chester - don't know about the RGB over scart issue, but i fully expect the original 3 cable setup would be better.
Ability to pass RGB over scart seems more like simply an 'extra feature' of scart.

later!

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190E's:
2.5-16v 1990 90,000m Astral Silver
2.0E 8v 1986 107,000m Black 2nd owner
http://www.maylane.demon.co.uk/190esmall.jpghttp://www.maylane.demon.co.uk/190esmall2.jpg