Jump would be very interesting...especilaly if I manage to detect actually a small jump during jog in place :-) How would you like to use it; do you want to cross some gaps that are deeper than one block or do you have other things in mind?
The offer with the models is great. If you are willing to release your models under a "CC By" license we could test some things :-). I don't have yet the code to add models; but plan to work on it soon. Would you also be able to texture and make simple animations? I also would really like to add some first simple mob to the game just to see how it is in VR; not sure what this would be; a classic would be a cube slime...)
If you want you can reach me also via discord: NeoSpark314#4701