It would be great if the "new" Weapons like M40A3 and so on could be selected in create a class

and played on every / more Servers, not only on the ones running new maps.

Is there any way to make this possible?

Not yet, unless you want fo suck out everything out of your PC.

New weapons require two maps to be loaded at a time, the one you're going to be playing, and another one which has the weapons in it's fastfile.

This requires double the resources to run, because the devs havent found a way yet to simply load the weapon part of the fastfile and nothing else

my pc can handle 2 maps at once

thing is attachments and camos.