I would like to see in the launch pad (or separate) an add-on manager/installer, with install/uninstall features.
I strongly support this notion, plus a self-extractor. The major reason is not because I would have any problems at all handling my stuff manually, it's majorly for looks... The impression will be more professional the less a user has to copy his files around manually. If an installation has to be done manually, a programm is considered "amateur" (in a negtive kind of way) by a vast majority of users, and Orbiter deserves better.