Ah yeah I forgot, the Drakk map has secret too, the one before boss.
There are hidden stairs leading to one tube with skaarj and some joke between these walls and also there are other things in that mission, including some panels.
As about UScript I can do uscript, but mainly for Unreal1, kinda comfused with uengine 2 things and I am noob at scripting for uengine2 although something i tried.
I did try to revive something and I have even the alpha sourceccodes and I gave some to greatemerald, but the problem is its incompatible with final u2, most of it as the engine changed pretty well. I tried converting one alpha map too, the old version of severnaya (also it has dead flyingsnake and these animals feeding on it on one of the islands), however with many deafult texturs as I forgot to convert these.
The grapple is still in u2 although in broken form a bit, it shoots a blue beam which you can grapple and ungrapple although its using is kinda difficult.