I HAVE TO AGREE 100% WITH THE COMMENTERS HERE
This has to be your number 1 priority if you want people to use your product efficiently and not give up and search for the competition as some have alluded to.
I myself, although wanting to, have not used it with certain clients for the lack of this Basic addition.
The completion rate of 15% seems to be stuck there forever, but its gotta have far more immediate importance (and possibly quicker to implement) than some of the other more difficult tasks you guys are working on.
The difference in efficiency this ONE feature will make to all of our productivity would be incredible. Infinity is literally broken without it.
Please consider bumping this up the order of importance.