show total/estimation from issues
this is essentially to see iteration and project estimation from the tasks in the project and iteration.
one specific scenario where I would find it useful would be when planning an iteration to be able to see how much effort is in the iteration as I add issues to it, to make sure that I'm not trying to do too much for example.
idea is to show total in the issues list view, when trees are visible ("components tree", "iteration tree", etc. this should help understand the whole effort required to complete the project