Writing history adjustment?

Would it be possible to allow for modification of the Writing History? Example: I write on Monday night 10pm-2am, so the history shows 500 words on Monday and 500 on Tuesday, but I would like this to count as one session recorded in the history so I know I really wrote 1000 words on my Monday writing session, and the latter 2 hours into Tuesday do not count for the Tuesday session when I write that night. Similar to the session count reset being able to be set at a specific time, maybe the Writing History could be manually adjusted this way too?