It has been a major annoyance of me to not be able to push orders to the front of the queue.
E.g. when a popcap shortage is nigh, I have to select a few entities from the same resource to construct a house, instead of just selecting a random few to build one.
Also saves _at least_ a mouse click.
This is WIP because I haven't checked PetraAI yet and there may have been some other oversights.