rules negotiation is exactly why i've always preferred video game interpretations of the rulesets.
"it's part of the fun!" -- yeah, it's social -- but for me it's social the same way that a divorce hearing is social.
The flexibility is nice, but id rather have an adventure with friends than busting out contractual minutia to determine how to proceed when friend Y does something the whole table thinks is stupid after his/her 500th attempt at other stupid shit.