Would it be possible to implement different site skins/layouts to choose from?
Being able to modify the .css of an individual thread would be cool
Looks like we can’t do that at the moment.
There are 3 in-built mechanisms in the forum software that allow some customisation of the site theme, but none that do what you are after (user-configurable themes).
I’m guessing that for the time being, we’ll need to use plugins/extensions like Stylish to make any changes.
Unfortunately as Law correctly pointed out site themes only work globally.