Currently it seems not to be possible to change/edit existing timelog entries, e.g. because of small typos in the comment or a mistake in the time spent field. Currently I have to create a new entry, copy & paste old data, make changes, and then delete the old entry.
It would be great to have an easier way to change time entries. For us it would be important to also change timelog entries of other users (if in group Admins).