First of all, just so you know, Unobtainmium IS the official name given to that mineral/ore in the film:
http://en.wikipedia.org/wiki/Avatar_(2009_film

(and I know full well what unobtainium is supposed to be, by the by....)

Second of all, I have no problem with Avatar being both a Hero's Journey and a Parable - the majority of the time, both go hand in hand with each other and work together to tell a narrative - and I am not "messing" with the themes and message of the film (maybe you're thinking of the other Avatar fanedit thats In the Works). The only real trims to the enviromental theme that I've listed so far is a few of Grace's exchanges to Selfridge. And why is it so terrible to get rid of the 2D (shoulde be 1D) sterotyped, cliched marine soldiers shouting generic phrases like "Fresh meat!", "Bring the heat!", or "Come get some?!"?