I wanted to bump this feature, but I couldn't find the original post, so here.
It would be nice if we could change the default loading screen. This would consist of being able to change where/if the the percent number shows, the background image of the screen, and where/what the loading bar is
First you'd see the default loading screen, which would download the resources necessary for the edited loading screen to run. (and then it would switch over to the custom loading screen)
Not 100% sure for how I'd like it to be edited, but off the top of my head I would say it could be managed with some world vars, in an interface file, or through the website