[plt-scheme] drscheme colours

When I use the DrScheme editor, it colours my stuff as I type.  This is 
good.

However, I (and many migraine sufferers) would probably prefer light 
letters on a dark background to dark letters on a light background.  Now 
I can change this colour by colour when editing preferences (although 
I've had problems doing this in browsers, it'll probably work with 
Scheme text), but is there any way to do this all at once (perhaps 
asking for inverse video or some kind of theme support)?

-- hendrik

P.S.  Here's the problem I had doing this in a web browser -- I can set 
the default foreground and background colour OK, but the settings on web 
pages override that.  Well, I can live with a few haughty web pages, but 
then I hit the ones that set the foreground without setting the 
background.  Foreground text becomes invisible.

-- hendrik