Is there any chance you could add a random timer screenshot? Something to take a screenshot every 30 minutes or so?
The addon called AutoScreenShot (
http://www.wowinterface.com/download...creenshot.html) use to do it. There is a minor issue with the use of code that isn't used anymore (this.something). Sadly I don't know enough about xml to make the needed changes.
I love Multishot and use it. I also loved the above mod as well but am unable to fix it. It seems like it would be a good fit as an option in Multishot though and could be simple to add given the previous work that has been done already.