Can troops and equipment abilities be used on another player's lane?
I found the answer in the official FAQ (not included in the box published by EDGE) published on CMON website (game creator) : https://cmon.com/product/xenoshyft/xenoshyft-onslaught


  Q: Can I use effects on other player’s lanes (such as the Storm
  Trooper)?
  A: Unless a card specifies “this lane” or “your lane” it can be
  used on any player’s lane


Since the Stormtrooper ability is "Once per round, this troop may deal 2 damage to 1 revealed enemy", it can indeed be used on another player lane.