The calc log is admittedly not always 100% accurate or clear--we've had this come up before in a number of forum threads (things like
showing wall hits are in the Ideas board, for example, and
multishot weapon hit display values were reported as a bug). That log's contents have never been worked on since the 7DRL version (when it was first added by request), mainly because the truly important combat info is present on the map. I've wanted to revisit it and it's been on the list for years now, but it's been low priority because it's a rather large project compared to the small gains in usability--adding certain features would require a redesign.
Actually, more or less your
same question was posed in 2015 
I currently have a lot of notes gathered for a potential future calculations log update, but it's currently held in the "bigger features" category, which is stuff that has no timeline but I really would like to get to some day. It's become a fairly large pool of semi-important features...
