While running through a script I can already see the yellow arrow jump from line to line at execution. It would be awesome to see how much time elapsed for each line after a run.

If this has too much of a performance impact it could be made toggleable. A similar feature that's already present in Visual Studio: Show the elapsed time between two breakpoints being hit.

Currently the only way to get this information (as far as I'm aware) is to add Stopwatches all over the code (C# Statements).