One of the things that annoys me about VE is that you can't edit just a single section. Even if you click on the "edit" link next to an individual section heading, you still end up editing the entire page. I remember reading somewhere that due to the way VE parsed the page (or something like that), this was unavoidable.
But, I just noticed that on wikitech, it does work! Clicking the "edit" link next to a section head does indeed get you into VE looking at just that section. For example: https://wikitech.wikimedia.org/w/index.php?title=Help:Toolforge/My_first_Flask_OAuth_tool&veaction=edit§ion=1. Wonderful! So, how does this work? Is there some option I need to enable? Or is wikitech running a newer version of VE and I just have to wait for it to get rolled out to enwiki?