Isn't that the same as q: (you know, such as there is q: , q/ and q?)? In which case, evil implements this as "evil-command-window-ex", which I'm sure you could bind to ctrl + f too (perhaps that should be filed as an issue with evil).

But I'm equally sure that if you made a habit of using e.g. spacemacs, you probably would not need to use it all the time either. But I guess I don't know your workflow. Why do you even use that buffer? I curse every time I accidentally open it.