Ok, just tried it on default and no other mods enabled. It's still messed up. Rendermen just move northwards across the map around the player in a rail-fixed line. They don't chase the player and the only way you can be killed by them is by staring directly at them. The detector and renderman death abilities (where you die from looking at him) don't even work half the time and are just straight-up broken.
This is with no other mods enabled.
RIP Renderman mod
If anyone has links to v2 or v1 of the renderman mod it would be much appreciated, cause v3 and v4 are totes broke