Charts: Drag and drop source time series from the list to the calculation window

Hi, 

I typically add all my timeseries to my chart before I start building a calculation. I’ve found myself trying to drag from that menu into the calculation window. That doesn’t work of course, so when I go to click the Add Node button, select a timeseries from the list, and add multiple ones they all stack up and its incredibly easy to have so many without knowing how many you have clicked on. I think this Product Idea is for 2 features.

1. Allow drag and drop from left menu of already added timeseries into a calculation window
2. stagger the nodes that have been inserted when clicking