Hey there, @Petar_Dietrich 
As always, a huge thank you for your feedback and continuous support!
I totally get your point regarding the enhanced navigation in the Custom CSS and JS editors and we also hope the devs will pay attention to this request in one of the future updates.
It’s hard to share the ETA now, but as soon as we have more news, we’ll share an update in this thread -More convenient Custom CSS & JS editors