one way is to use hmt3.5
in the weapon fold out, click zoom (the one that lets you edit how much you want too zoom) and make it like 999999 then make everytime you zoom in like 2times or whatever you want it to be.
just want to point out that unless I'm missing something, that would kinda suck because, you'd have to switch weapons to drop out, or press the zoom button that many times...