Often for a set of elements I may need to retrospectively add the same class because copy paste is more time consuming, the most common example is for images.
Being able to hotkey to add the last added class would make it super quick to add to the set, currently I have to search suggest it each time.
An alternative to this could be to have search suggest order by latest used instead of alphabetical.
Admin Note:
It's possible to select an element and press CMD + Enter (on Mac) or CTRL + Enter (on PC) to then type in the class name to apply to the selected element.