Thanks for your comments and suggestions. The game was published two years ago, so has long since been put to bed, but if I ever make a follow-up game I'll bear your suggestions in mind. Incidentally, there is a vertical aim assist, if you sweep your aim past an enemy that is up or down a hill you'll notice that the laser sight does lock on to the centre of the enemy. That only works when there is an enemy in the line of sight, however, it doesn't work when simply aiming at empty landscape. Perhaps that was what you meant.