Either split the pane into upper half/lower half, or have the tag pane at the right side.
Tag pane is very useful for workflow, and I would like to have it always opened. But I need the file pane or the bookmark pane also, so it would be nice if I could open them at the same time.
The split would be cool!
We’re considering officially adding this to our plan, but for now, if you really want this, you can try this unofficial extension by @Piotr: Files and bookmarks in one view?
It’s not published 
I will integrate this with Open in new tab, sorting, embedding, separators and other “improvements” today/tomorrow.
No worries! Take your time. I’m just mentioning since I remember reading it over at that post.
I’m not rushing you I swear! 