Since a number of models here use "fantasy colours," that is, parts that were never produced by TLG, it would likely help a number of users who want to buy parts at Bricklink, to include this feature. One could perhaps also include the option to have chromed bricks also allowed - if the model features the colour, seeing that those tend to be available in addition to what TLG has released. If there is a brick that has not been released in a particular colour, a further beneficial addition would be some option to "repaint all," as for example going from 11 Pastel Blue to 212 Light Royal Blue.