Yes, exactly, this plugin is currently in development and features will be added over time like mentioned in the first post.
I've updated the plugin today because my PR was accepted yesterday that quickly that I had to implement it like it is now, I will maybe add a drop down or something like that so that you can choose which shell you want to connect to, but I'm not too sure about that now. I'm currently on a short vacation and this will take some time.
Yes, the coding in the LXC containers is different that's why it looks a little awkward, you can theoretically change that in the LXC container but you don't have to by using simply bash, fish, or whatever is the shell of your choice.
I'm also open to ideas and feature requests but it can take some time since I'm really busy currently (like always... ).