I know that some languages on Duo have "bonus" lessons that you can buy with Lingots (I went through a couple in French before I foolishly decided to delete my progress in a fit of frustration). Stuff like idioms and flirting. Is there anything like that in the works for Swedish? I feel like, to some extent, it's already been integrated into the current lessons, but dedicated lessons would also be interesting. That, and perhaps there are some things that are more distinctly "Swedish" that could be considered bonus lessons (though off the top of my head, I can't think what, exactly).
We'll start building bonus skills as soon as Duo gives us the tools to do so, but unfortunately it isn't technically possible at the moment. We'll probably make some discussion forum to ask users what bonus skills they want, so if you come to think of something, write it down.