My two cents:
The DC units system still has a bug where if you turn off “Display units format” in Model Info/Units, all the units dispalyed in the Component Options dialog switch to inches.
Several instances of the same component placed inside a DC should be able to be controlled individually. now they all have to be made unique which creates a proliferation of component definitions. Also, when a component is placed inside a DC and outside of it, the component outside is not isolated from the nested one.
Anssi