Most needed feature?

I cant think of a feature that I would like/need more than the ability to see in an overviewable manner every instance of global variables, and every connection that a function has troughout a project.

Imagine being able to choose a global variable, and then a list with every file that uses this global variable appears, and you can click it and go there and view the code. Maby even a link-list.

Or being able to view every file with the particular code that calls a certain function.

Once a project starts growing in size you just loose track of every little button/mc/etc. in every little file, in every little layer, etc. that calls a function, or uses a global variable.

Maby there is a similar feature now that Ive missed (oh pretty please) ?