I found the following in sankey_diagram.js.
//Sort and only allow top 3 and put the rest in "Others" bucket.
var MAX_TOOLTIP_VALUES = 3;
By changing that value you can get more results however the Viz does not really balance without making significant changes. It works if you double it however it starts getting too big.
Also, it does not help by hooking it up to a variable in the general tab as the tooltip rendering is not really designed to be dynamic. It would take some work to make that happen.
That being said I have my immediate answer and when I find the time I will investigate further.
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