This is an idea from forums. I, like you, have been using relationships to make a "reminder" post for things like "TODO for version 1.2.3" and then assigning all the bugs I want to fix in 1.2.3 as children of that bug, much like you've done with http://bugs.mantisbt.org/view.php?id=4818 The problem is, as new bugs are reported and as the status of old bugs are changed, my TODO list slowly drifts further and further down the list.

This is where the sticky idea comes in. If I set the sticky flag, then this bug report stays at the top of the list regardless of what characteristic the bugview is sorted by. If there are multiple sticky bugs, then it is treated as two lists. I.e., the sticky ones are sorted and displayed, followed by the sorted list of non-sticky bugs.

I just think this is a minor little feature that makes keeping a TODO list bug much easier.