Another thing is rewind button for 30 days and one year.
A copy button isn't a bad idea. In the meantime you can achieve the
same result by logging an existing item, editing it, then deleting it
from the log. The app will delete the entry but will remember the item.
The trouble with extra date jump buttons is the amount of menu clutter they introduce. Are you aware that you can use the graph view to jump to a date? (Scroll back in time on the graph, tap a column, then tap the "go to date" button that appears at the bottom.)