In VE you can type "==" at the start of a paragraph to start a level-2-headline. It would be nice if typing "=" at the start of a level-2-headline would change it into a level-3-headline and so on. This would allow to type "===" to create a level-3-headline, just like in wikitext (the first 2 = create a level-2-headline, the third = would change it into level 3).
As a headline shouldn't start with an equal sign, this automatism shouldn't affect "normal" VE editing (i.e. by users who don't know or care about the wikitext syntax).