Can non-system-admin users of a Lyceum installation upload and/or modify their themes or plugins?
No. There is no way to provide this feature and also ensure proper security. The WordPress theme/plugin architecture allows for arbitrary PHP and MySQL code to be included in themes and plugins. This power and flexibility has given birth to the huge community of theme and plugin developers, and is one of the main reasons we chose to multi-blogify WordPress. Once a theme or plugin has been installed by a Lyceum system administrator, the administrators of each individual blog can choose which theme to use, and which plugins to activate. Create a blog on our demo installation and try it out!