Thanks, this is a great suggestion. It's definitely scary that there's no way to visualize, organize and edit presets in MD. One intermediate way this might happen is to provide a preset export file (in, say, XML) and be able to import that same file. One of the issues is that the preset values are tied to unique IDs that each control has, but those are not exposed to the user anywhere. Since names of controls aren't necessarily unique, it's hard to think about how this would look to the user.
For now, this will be added to the suggestions list, but the more clarity and discussion we have regarding how this would be implemented (in the simplest way possible), the more of a chance it has of getting implemented.