It's not there because it's an unbounded value, and the gadget requires countable values. The nature of the time spent field is that for 1,000 issues you have 1,000 separate values. Some of them might be the same. All of them might be the same or limited to only a handful of values, but there is still the option to have 1,000 different numbers there.
Unbounded values render the gadget pointless. The gadget is for groups of known values.
Personally, I'd like to see it allow for dates or date ranges, but unbounded numbers are never going to be useful.
There's a couple of "timesheet" addons which can help you with Time Spent on a dashboard (I am guessing at what you're aiming for, and JIRA doesn't quite do it off the shelf, but the timesheet addons are very much worth a look...)
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