Ink limiting can be useful for papers that cockle, or don't dry as expected. For any of the HP media this isn't really necessary. I know Joe Holmes adds ink to make Epson profiles, but this just doesn't work on HP's. For whatever gamut extensions you get you create worse shadow detail, and other problems . It is something that I suggested as useful for many years. It is something to be used with precaution though, if it does become part of a driver level user parameter. Currently you can ink limit in most rips. That again is not always what a photo reproduction ideal workflow would want either. Ink limiting is something that can be easily changed in firmware from a programmers point of view that is. The question of star wheels or the rubber drive wheels is another.