The type parameters are displayed in the Properties Palette but can't be changed by clicking on it. We have to do one more useless click on Edit Type, then change the type parameter we want. All parameters should be editable directly by clicking on them: instance parameters' text should be black, type parameters' text should be blue, or magenta, or other color, to clearly distinguish them from the instance parameters. Locking parameter informations under many different buttons doesn't help in learning or in editing Revit faster. I know many users will say such approach is dangerous, one wrong value on one type parameter ruining entire projects, but ,at least make it available as an advanced option. For the users how know their business and choose speed over extra caution.
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