After downloading several .dlls more than were with that editor fix pack you get a lot more freedom. It is possible to export but not all of them work. I got some trees and stuff exported to ut99 where you can them export them usefully. I'll take a look soon and find out which files you'd want to export.

As for those sounds, in the script editor they are indeed mapped to functions (special death and bonus death I
believe?) I am not sure but I believe based on some of the code that they were intended for optional use in the unfinished multiplayer component, specifically the broken pit animation when you play on the map sky-high in deathmatch or treasure hunt modes