Setting an "ignore threshold"?

Might it be useful to be able to set an "ignore threshold" of sorts for apps or sites that are used under a certain amount of time? For instance, webpages that are open for 15 seconds or less (or some other user-definable number) are not logged. This might be useful to cut down on the massive amount of websites that I've visited for less than a few seconds but end up adding up to several hours in the 'undefined' category. Most sites I've visited for that little of time are popups or something, or very likely sites I'll never go to again, and thus don't want to take the time to properly tag.

Does this make sense? This may already be implemented, but I can't seem to find it.
 
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