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Time and time estimates are the least important things imo. If someone bills by the hour, there are ample good ways to do that already, and estimates are always inaccurate (something like story points are a better system). You should track effort and status, not time.

Automatically tracking time of an issue as it moves from Doing to Done and maybe then predicting (a default) Time Estimate based on the textual description and past issues would be nice :)

Yes that makes the life easier. Tracking is always pain in the a*. This could make a huge difference.

How does tracking time for each bug help in your work? Is this to manage SLAs or productivity?

The multi level comenting makes sense.