When the final product is released there should be an OPTION to switch FP view to left trigger..
It is 1st person option kinda you have to click the right analog stick.
how about left trigger (half) TPS zoom and a (full) left trigger Ironsights/scope - 2 functions with 1 b.u.t.t.on
Have it like mgs4 and in the options you can put it to toggle of you want it to go straight to first person or the third person zoom.
I really don't see why anyone would ever want anything in first person, but I am sure there will be more b u t t o n mapping options in the final game. The beta has obviously cut out a lot of options, probably to help limit file size I am assuming.