I would be very useful to have the ability to see the total time a task took and when the datetime it was resolved when filtering on completed tasks. I believe the only way to show completed tasks right now is with dstask show-resolved.
Possible Example:
dstask start 5
wait 4 hours :P
dstask done 5
dstask show-resolved <-- here it would be nice to see that task 5 took 4 hours and I completed it at a certain datetime.

With this, when viewing a task, it would be great to see how much time I've put into a task so far in case I wanted to limit a research task to a certain timeframe. Example dstask 6 could show a line for accrued time or total time if completed.

It there currently is a way to either and I'm just missing it please let me know :)
Love dstask so far tho, excited for the upcoming features