It would be very nice to be able to right click on a variable in the middle of an equation and select "Go to definition" that would take you to the most-recent assignment to that variable.
The converse would also be nice: right click on a variable and select "Go to references". Pick one of the items in the result list to go to that point in the worksheet.
If you've ever done this in a modern IDE, you know how handy it can be.
