Mouse position to world coords (in script)

[(MoA) Shaun]

Why not use a weapon, the "Pointy Finger", cast an invisible projectile?

Must be client side :o

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[Space Guy]

If it's all clientside, then it won't work for anyone without the mod and can't actually do anything except for general information. Serverside, in this case is better...

Player::ActivateStuff(%this) is the one which does a raycast to find vehicles and 'push' them.  Unfortunantly you can't intercept this raycast and change it for other things, so you'll need to do your own...