Not so long ago I installed FEAR SDK (1.0.
and guys this editor is Amazing, so easy and modder-friendly, You can mod whatever You want using only a database editor (to add a weapon for example) (where you would need to code that in for source). WorldEdit is cool also, it has direct connection with Max, you can export your map to it and then get it back to main editor (along with entities and props!!!)
I know it's a bit too late but fear gameplay owns and having more custom sp maps would rock:)