A "Renderman Difficulty Level" would be nice. 1 (Players are yawning) to 5 (DIE DIE DIE DIE DIE AHAHAHAHAHAHAHA!!!!)
Also an output event (player) to "incRender", which when toggled would increase the weight with which Render targeted the individual who set it off. Reset the increment amount when Render actually killed the player. This would allow for "Render Objects", so when someone was triggering the findables of the hunt, they'd get targeted more and more.
Finally, a possible "solo targeting", where it would increase the targeting weight if the target was alone.
Possibly a "scaling" that would cause Render to appear more often with more players on the server so that the chance of one given player being attacked by Render would be about the same.