Add "unfollow" feature, allowing users to turn off notifications for replies to their comments/topics
This would allow users to more effectively disengage from arguments. It should probably be something disabled by default and only enabled on a case-by-case basis, not a global user setting though, IMO.
edit: Feature also requested again, but for a slightly different reason (avoiding getting spammed on busy topics) -
To upload designs, you'll need to enable LFS and have an admin enable hashed storage. More information