In InDesign CS2, it is possible to make a percentage tint of a CMYK mix, by creating a new tint swatch from the colour palette. Is there anything comparable in Illustrator CS2? Or do you have to go via the rounabout route of converting your CMYK colour to a spot colour, adjusting the slider to the percentage and then once the tint swatch is created, converting it back to CMYK? Seems very roundabout and inefficient to me.