Axesor,
I'm thinking about to making a hardcore mutator for the current version of RenX (v5.354 at time of writing).
I looked at the changelog for your own hardcore mutator and I was quite impressed. Most of your ideas were really good - such as stopping the one-shot kills with snipers and increasing the shotgun range.
I'd like to re-implement a lot of your tweaks, however I'm kinda rusty with UnrealScript. Would you be willing to share the source files for your mutator? I'd like to just have a look and see how you did things if that's okay with you?