See T12175. This is a different sort of race-esque thing.
See PHI208. This describes a performance issue on workboards with very large numbers of tasks.
See PHI240. This describes a usability improvement for "Move to column...".
See T11036. Subprojects should have columns, this is just somewhat involved technically.
See T12144#226172. We should suggest "Create Subproject" above "Create Milestone", and maybe put a huge warning on "Create Milestone" that requires you to answer a quiz about whether milestones are heavy, immovable blocks of stone with strictly-ordered, sequential numbers chiseled on them, or flexible cloud-like suggestions.
The Conduit documentation for maniphest.edit needs an update:
Note that this affects only the "natural" position of the task. The task position when the board is sorted by some other attribute (like priority) depends on that attribute value: change a task's priority to move it on priority-sorted boards.