I will support Kovid's 75% number. I have made a few suggestions and have seen (maybe after some discussion) that they were implemented in some form (not always exactly), probably because they triggered the creativeness of the code writers.
Calibre is
amazing. It runs on 3 operating systems, supports dozens of reader devices, interfaces with thousands of News Feeds, supports many document types,
All while being updated a couple of times a month.
WOW.
When an
idea surfaces, it gets filtered by the big picture of the impact to all the parts that work. Do this, and you break x,y and Z, which would take major effort to re-integrate if we made this change (AKA ripple effect).
Tags are evolving. Currently the use of " [tags] " are being implemented I hope that this class of (think of them as a control/note tag) tag will not be included in the "book tags" written into the "jacket section" when a file is converted.