So if this already has been asked I´m sorry, didn´t find it yet.
So actually it would be crazy epic if there were those techniques.
So there could be these manipulated Shuriken, after throwing them you pull the string in one direction and the string becomes visible at that point. The Shuriken turns the direction you pull it.
Also would be cool to have ninjutsus for the ninja tools. So after throwing the shuriken you do the shadow clone finger signs and it duplicates. This would require being able to link your upcoming jutsus to your ninja tools or something like that.