so you can just use the native .so extension
Sorry, i forgot to mention it, but as stated in my original proposal (in December), platform-native shared library extensions (.so,.dll,.dylib) should be supported as well. Still, to avoid name-clashes with system or third-party libraries having a pd-specific extension is important. .pdo doesn't sound too bad (.pdx and .pdb don't seem to be good, because ambigous choices)
best greetings, Thomas