Set leading as a pecentage of the type's point size.
I wish you could set the Leading as a percentage instead of a point size, so if the point size changes the leading stays in proportion. And this percentage should stay persistent, once I enter a percentage is should stay that percentage and not revert to the point size of what that leading is. I know you can modify the Auto percentage in Preferences, but I want to be able to it on an instance by instance or stylesheet by stylesheet basis. This should be doable any place the leading can be changed.