[atlas-sw-dep ML: 2004/9/22]
You can set each of the limits to a specific number, for example:

MessageSvc = Service( "MessageSvc" )
MessageSvc.OutputLevel = 3
MessageSvc.debugLimit  = 100000

I see that you can also set colors

MessageSvc.useColors = TRUE

MessageSvc. debugColorCode =  ...

for
    MSG::BLACK;
    MSG::RED;
    MSG::GREEN;
    MSG::YELLOW;
    MSG::BLUE;
    MSG::PURPLE;
    MSG::CYAN;
    MSG::WHITE;

You might have to play a bit to see how this works for the color. I 
imagine that you turn it on and can just do  << MSG::BLUE <<.

.....

The default is 500 messages per level per source. Can be changed
globally by 

     MessageSvc.defaultLimt

or individually with

     MessageSvc.fatalLimit
     MessageSvc.errorLimit
     MessageSvc.warningLimit
     MessageSvc.infoLimit
     MessageSvc.debugLimit
     MessageSvc.verboseLimit