I recently started using Usage Records for when I use the pens that I currently have inked, which is a great way to assess what I’m using the most. However, there are days when I forget to add a Usage Record. It would be awesome if I could back-date a Usage Record.
For example, I would like to be able to log a Usage Record today for the pen(s) that I used yesterday.
Hi!
Added to the backlog of features! Thank you. 
I second this and would even like to be able to go in and add usage records for pen-and-ink combos that I already archived. (I realize I might be the only weirdo who would want that last feature!)
Thirded!
This would be so useful for those of us who forget to log every day.
That’s now done (or has been for a few weeks now).