Shawn's cockpit mod dosn't do that, maybe you could ask him what he did!
The reason is simple: no glasses effects is used in his cockpitmod
But... i think its possible to set "refflections" of weapons on cockpits in Tfiles (TBullets.pck something like that i think)
but i think too to loose reflection of weapons effects on the ship texture (dds)
For the moment (if u are able to do that), the simple issue is to delete 543.jpg 1000.jpg and 1001.jpg of my mod ... but u loose sun effects on glasses because you delete textures too.
Personaly i prefer with, so it's not a priority for me ...
ask me if u want a link of my mod without those 3 textures its very simple for me no problemo !