Also please disable this "outdated" plugin notifications
I don't think it's done by Opera.
It says - plugin outdate, please update plugin:
Do you have the correct Flash installed? Chromium based browsers use ppapi Flash.
Please add - plugins control, so i can switch off/on different versions of plugins
The only third part plug-in supported by Chromium is Flash and you there is a section for it in Opera's settings page.
Anyway, suggestions and requests go in Suggestions Box.