To reduce the clutter on the screen how about
If you do not move (W,A,S,D) for 5 seconds your minimap begins to fade out.
If you do not shoot or change weapons/firing modes for 5 seconds your ammo counter (The 3,5 one) fade out.
It would help reduce the on-screen clutter.
Also

What about instead of having ironsights 'toggle' why not make it so you have to hold down the right mouse button? IRL you can just move it once and its there

You have to hold it

Of course, this may only work with 3D ironsights/the delay (Like the ones on the SAW)
These ideas are based off of COD2
Thoughts?