I wrote up a ruleset implementation (but as a corerpg extension at the moment) here:

https://www.fantasygrounds.com/forum...omated-ruleset

Details in that thread (in extensions subforum). I'm somewhat new here, so apologies for the double post (and please remove is this is not kosher with the forum rules) but I figured people looking for rulesets would come here first, but technically I'm posting an extension there (which encodes a ruleset).