As the title says, there is no way to know what state a repository is in. If all are enabled it is easy to deduce what happens when you press the space key. However, if one does not remember which repositories were disabled, it is difficult to restore them.
The solution I propose is to add a third column, which informs what state a repository is in, and optionally, a combo box similar to the one in the package explorer, to filter the list: Show all, enabled or disabled.
Perhaps you can add a select all button, one to enable whatever is selected in the list, and one to disable.
Thanks for the reply.