It would be nice if you could add an application config (called LibUsbDotNet.dll.config or just an example of that file) to the library with the following content:
<?xml version="1.0" encoding="utf-8" ?>
<configuration>
<dllmap os="linux" dll="libusb-1.0.dll" target="libusb-1.0.so.0"/>
</configuration>
With that file it's no more required to add a symlink into the application directory to libusb-1.0.0 (ln -s /usr/lib/libusb-1.0.so.0 libusb-1.0.so)