It might be possible to make a serverside BSP mod to fix the shitty AT-AT projectile clipping on Hoth.
This would only affect weapons. Players would clip the same as basejka. Getting blocked by the AT-AT, jumping onto it, rolling off it, etc, would remain exactly the same.
The only difference: weapons would clip properly. No more missed snipes because you hit an invisible wall. No more golans bouncing off invisible walls when you were trying to shoot the walker.