Composite and svideo has always had problems with red, if you try, the reds will bleed out like crazy because of problems with making the colour subcarrier (pal is a bit better with its gamut but still leaves a long way to go compared with RGB or component)
If you could disable the reduction of the colour to make it legal ntsc values, the resulting signal would just mess with the chroma decoder in the tv and just cause an ugly mess when they were attempted to be displayed. Things like half the screen flickering into green instead, black and white over part of the picture and other things that would be much worse then a slightly orange tint to your red.
Your gonna have to live with it if you insist on using a 55 year old video standard.