VVT and VTC

I've been making a few modern engines recently and I only just noticed despite VVT weighing and costing quite a bit, it still makes barley any effect on the economy or power curve... I don't think I looked closely enough before, so I did a bit of research and I stumbled across something called "Variable Timing Control" (or VTC) which is basically VVL except it constantly adjusts the valve lift throughout the rev range which predictably, is currently used by Honda. I think this will be a great addition to the game. 
So the real questions really are:
1) Does VVT make any effect?
2) and can we implement VTC?

So the real questions really are:
1) Does VVT make any effect?
2) and can we implement VTC?