While that would be easier on the user, I think it would require a different layer for the editor and a whole set of different tools.
Obviously once developed, it would open up the possibilities for other editing tools within the Player.
What I suggested above could be as easy as copy-pasting existing code with minor modifications to the variables that are called and then passing on that info to be parsed by the renderer. I think of it as setting boundaries to an array, but I must point out that I have absolutely ZERO clue as to the code behind the Player app.
Maybe both of our suggestions are equally complex to implement.
I should point out that browsing has sped up considerably with the newer version of both RED and Leia Player.
Before I even tried to clear cache, clear data and uninstall updates before I reinstalled form RLL or from the APK.