I was wondering if it would be possible to add presets or custom guides in the manager. I'd love to be able to quickly load a 12 column grid into my Guide Manager without having to go through and painstakingly create presets for every screen size that I may be developing for. Overall, the 12 column grid is an industry standard so it just seems like a feature that'd really be wonderful for Designer. Calculations are even already done for you! http://gridcalculator.dk/#/1140/12/20/20
Thanks!