I know there are mods to increase the FOV, but I haven't tested any of them myself.
A popular Mass Effect modder called Mgamerz made a mod called Persistent Settings (FOV) which adds FOV sliders to all three games. Increasing FOV zooms out the view a bit, so maybe that works out for you. I don't think it will be full body in combat, though.
Due to forum rules, I won't link to the mod directly, but it should be easy enough to find with Google.
Since I haven't used this mod, it's not an endorsement, but I hope it does what you want.