I use the bubbles for the standard "hit points" that I'm sure almost everyone does, but currently I'm also using them for spell/status effect durations since it is easier for me to count down that way. The problem comes in when there are more than two spells or status effects on a token. It would be nice to be able to add more bubbles as needed. Of course, this would be a moot point if nontoken elements could be added to the initiative tracker, but until one or the other happens it makes tracking spell durations efficiently very difficult.