Thanks @lassoan for your insight. It is indeed a lightweight visualization for research purposes and fast iteration.
I was thinking on hacking the Window Interactor (that is able to listen to the keyboard) to accept numbers [0-9, “,”, “-”, backspace and intro] to populate the text widget as a search box.
But yes, I realize that this is stretching the original purpose of the code base.
Do you know of any modern integration of the GUI toolkit imgui with VTK? Qt is a dependency too big for my purposes.