Oooooh, that could be remarkably useful.
It is. Or, well, it has always been. Since day one hunters were able to use two traps at the same time - then, with patch 2.3 and without
any testing done on the PTRs, this was considered a "bug" by Blizzard and we lost our ability to double-trap. After all those years they even had this funny text in the patchnotes: "Fixed a bug where hunters could trap two targets at once."
The result were - EU and US combined - around 400 pages of protest postings in the forums, as this basically only affects instance PvE and is not even a part of balancing PvP. So all of a sudden we found it in the 2.3.2 patchnotes: "Freezing Trap is no longer limited to one target at a time". Change reversed.
I´m happy. Seriously, trapping is what I love to do, PvE-wise. So tomorrow will be a wonderful day.