Digital BW, The Print

Can anyone tell me how one uses the Manual paper slot in the rear of 
the 2200 for thick paper when you are printing with QTR/OSX. In the 
instructions which come with the printer it says,"You cannot print on 
thick paper in the Manual feed slot when you're printing with 
Macintosh OSX Applications" Can this be true? There must be some way 
to set up the boarders, etc. What is the procedure?

thanks,

John H