I would like to see a indicator of my grenades flight path when I hold the grenade button, then to throw the grenade along that path when I release the button.
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You don't see military soldiers asking to be able to see where they will throw the grenade before you throw it, we don't need it. The game is meant to be fast paced, not "wait a moment, I need to throw my grenade that little further". Some people these days, learn some co-ordination.