Right now the only way (I know of) to re-enable a component is to look for it in the browser, select it, then Enable it. Finding a component in a large assembly can be very time consuming and inefficient. I suggest a "SHIFT" (or "CTRL", or whatever other keyboard key) plus right-mouse click on an "un-enabled" component to select it, even if all that selection allows is the "Find in Browser" option so it can then be enabled.
