I am working on a project for Ubuntu App Showdown Contest (https://launchpad.net/wuuzy) and I wanted to know if it is possible to install things like libraries in /usr. My project, in fact, use an extension system to improve itself with more options. It is like a plugin system and it generates libs which are currently installed in /usr. Also my app generates a gir file installed in /usr/lib/girepository-1.0/ and in /usr/local/share/gir-1.0/. It uses also a gsettings schema which is installed /usr/share/glib-2.0/schemas/. Naturally I install also the .desktop file in /usr/share/applications even if I have a copy of it in /opt/PROJECT.
So what I really want to know is if this installations targets are allowed for an app which want to join to the Ubuntu App Showdown Contest.