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Right click on a constant on the block diagram and have an option to "create type def". Automatically creates a (strict) type def with the name of the constants label.
Also - double click type defs to open them for editiing. Similar to double clicking a subvi to open it.
Also, the Front Panel page in the options dialog has a check box which lets you open the control editor by double clicking a control, which I believe should answer the second part in your idea. If it doesn't, I suggest you create a new idea just for that.