Not sure if it can be done but it would be awesome if the loading happened in the background and the animation i chose played over and over until the pack was loaded.

Well.. this will not work like I wanted it to work..
Would be too much work.. I'm really sorry :/

The game intro animation is getting loaded too in that loading process ^^ I could prioritize the pre-rendering and stuff for the game intro and render it over the loading screen after it's done, but that would probably be a very laggy slideshow adventure :D

Tl;dr: Nope, that’s not possible, sorry :/

Only thing I could add is a little preview of the animation that is currently getting loaded ^^

thought I would ask.

Would it be possible to put a new static screen up that the Mojang Logo and the memory data bars would run on top of?

You mean a static background image? That would be possible!