Or what would the ideal forum UI be like?
Would it be possible to have the main Forum thread layout - user configurable?
For instance I could rearrange/position the threads I use most to the top or the forum could adapt it’s UI to show quick links or shortcuts to the threads I visit most.
You mean just like the Bookmarks feature in your browser? 
LOL no room there for any more Unity links.
No just a draggable/rearrangeable forum threads page. Even if you could rearrange the sections.
I don’t think it’s possible. Forums are based on some kind of web software (I think vBulletin :/), and therefore it might be a huge headache for web designers to create draggable forums.
Idea is awesome. It could be even more awesome if we could add a special “Favorites” category.
XenForo actually, and no. I did think it would be cool but there is a lot of work to make it happen on the front and back-end. We also don’t want to create too much of our own stuff on this forum like we did with the old one as then we run into huge issues when needing to update.