I see I have this SVHS output on my Geforce 3 too! (Stupid me, jumping to conclusions before checking actual hardware).
If I understand all this correctly, it's no use putting the scart coming from the SVHS-out into one of the RGB slots on my television, as the output plainly isn't RGB?
(I ask this because both RGB slots are taken by my PS2 and my DVD player, and I hate switching cables).
Thinking now... but would a SVHS->S-Video cable exist?