I second the petitions for enlarged binoculars view
The same size as in the F5 view would actually be perfect, BUT if possible I'd like to see simply a rounded hole, as in the current gun optic, because this is also what you see when looking through binoculars.
A series of numbers in the reticle would also be of some help, as I'm not sure what they are supposed to be (1 mil, 2 mil per mark?)
A final suggestion: Having the switch from standard to zoomed view and back via mouse wheel would be fantastic because of its intuitiveness and no need to press keys, which is always distracting from what is going on in the screen.