Lore writer application freedom?

[Marlon P.]

Awhile ago caelphelon remarked they have the plot for the lore plotted out a few months ahead. On the skrell app theres also this required field:

"1. Your plans for the future of Skrell, and their involvement in the affairs of the Orion Spur."

Im not interested in skrell lore development personally, i wanted to ask how much freedom a newly hired skrell lore dev would have. How malleable is the plot? What level of control does a writer have over their species' destiny? 

It would be valuable to know so people have an idea, even a rough one, of how ambitious they can be in their apps.

Thanks!