Targeting mobs far away in OS

Is there a way to easily target the mobs that is furthest away from player? In Onslaught when there are swarms of mobs it gets a bit challenging to target incoming mobs that are (often) moving. Clicking on enemies is not as easy as it would seem - mobs have smaller clickboxes then they are in reality and also they often quickly run.

Targeting nearest mob and then running as far as possible to damage huge column of enemies would be successful if not for the fact that they often die too quickly and you just lose your prime target.

Shift+tab targets the furthest target