I guess my improvement request would be regarding the data manager and updating reading progress. I hope I’m requesting this in the right place 
The dialogue when you press “update” on a book you are currently reading is very minimal, it seems like it can only add reading sessions that happened today. I don’t know a way to add a reading session I did yesterday, apart from adding a session, then editing that session in a different dialogue, the data manager.
Also, if I have a book set to percentage, I also want to see the percentages in the Data Manager (or at least be able to fill in percentages when adding new reading sessions, not having to calculate the pages manually). The data manager also not really being intertwined with the progress update dialogue is kind of weird to me. When I add sessions via data manager (e.g. “read to page 50") and then update the progress to page 80, the entry in the data manager shows “read from 0-80”, not “50-80”. Which probably stems from the fact that adding a new session in the data manager doesn’t update the “pages read” at the top of the “data manager” and neither the “current page” under “Basic Info” or “Progress Update”, and therefore not the percentage on the dashboard either. These are probably already documented elsewhere, but I’m not really actively following all the forum discussions or bug reports
When adding a session via the data manager, it would also be nice to have the last page read/starting page prefilled, and maybe today’s date preselected as well?
Also, when I add a new session in the data manager and put 30 minutes for the minutes and nothing else, I want it to understand that that means “hrs=0”. I get an error that hrs is empty if I try to add it that way, and it gets me almost every time. Currently it has the greyed out 0 already filled in in the hrs field, so either prefill that with a normal 0, or make the hrs not required.
Additionally, when adding a new reading session there are three buttons: Close, Save, Delete, that feel like they are in a non-standard order? I usually expect “Save” being the right-most button. (The colors have so far saved me from accidentally deleting entries, at least).
When adding a new session, Close and Delete have the same effect. An alternative would be to just have “Discard” and “Save”. When editing existing sessions you obviously need to distinguish between Close and Delete; maybe a small delete / trashcan icon in the top right could be an alternative?
Requests for the future:
I like being able to choose between pages and percentages; maybe there could be a third option added, “Kindle” pages or bookwalker / ebook pages? I know you can edit the page numbers, but I don’t want to change the page numbers to 2000 when it’s a 500 page book and have crazy “has read pages 1500-1800” activity updates. I also want to keep the reading speed graph data accurate and comparable across books. I want to keep the “pages read” data true to the actual paperback count, but I want to enter the kindle page number I’m currently on.
Maybe just adding a decimal to the percentage would make me happy, since rounded percentages feel really imprecise.
Also maybe there is a better way to deal with 文庫本 and 単行本 editions? I try to record all my pages in 文庫本 equivalents to have comparable reading speed; ideally I would want both page numbers pulled from Amazon and then have a dropdown to choose which page number I want to use. But most people probably don’t care about page numbers in such great detail
Okay and one last thing: I want the calendar to automatically fill in a reading day if I have recorded a reading session / reading activity on one of my books.
(In the far future, maybe even displaying pages read on the calendar, or maybe color-code the calendar like an Anki heatmap? And also pages read over time stats, not just days read or hours recorded)
