Hi,
I feel i'm not really qualified and competent enough to suggest improvements,
but this is a simple yet useful idea imo, and I was wondering if there's a chance that this will ever be implemented in the Arduino Editor.
I regularly work with MATLAB, and one of the very useful things in that editor is that when you set the cursor on a certain variable,
all the instances of that variable are highlighted so you can quickly navigate through your code and spot the functions where that variable is used. Also, when you change a variable's name, the editor suggests to replace all the instances of the regarding variable to the new name you gave the variable. The actual message is "Press shift+Enter to replace all number instances of old variable's name to new variable's name.".
It saves a lot of time, and it's more faultproof when changing a variable's name.
It's a very useful thing to have and it'd contribute to the Editor imo, so I would like to ask you guys to take it in consideration. 
If this was already asked please notify me.
Ciao