I believe this feature would greatly increase the usability of Construct 2 IDE.
Basically, a search feature that searches for all events using the search term, which can be an object, a variable name or a string.
As a result, all matching actions and conditions are highlighted.
Example: troubleshooting a project. Lives are bugged, don't behave as expected. I search for the variable "Lives" and all actions/conditions containing the variable are highlighted. This makes locating the bug much easier.
Another example: Say I am removing some object from the object, however quite a few events are dependent on it. I have to adjust those manually, but the project had gotten larger since then and it is difficult to find all references of the object. I would search for the object uses and all matching actions or conditions would be highlighted.