I don't think we need a standard ruleset of any sort. I believe that doing so will end up limiting the imagination of players looking to host games. Fishin's rules are just there for people to get a good idea of what things they should be looking to deal with when they're making the rules. They're also well written, and make for good material to work with if they align with what the host wants.
They are NOT, however, official or standard in any way. They're given as a sample set of rules. The moment you tag them as standard or official, you're changing the way people view them. There is absolutely no need for anything to be considered "standard" in mafia to start with. This might sound ridiculous to some people, but if you ask people on mafiascum what they think of outside communication, or all villagers having individual roles, you'll probably get a similar reaction. It's by messing with the basics that Smogon mafia has become what it is today.
Also, about Fishin's rules, each point should be considered a basic setting, which the hosts may configure to get what they want in their game. For example, you have rule 1. That relates to deadtalking. What Fishin has done with deadtalking is just one option. You can do different things, such as completely disabling deadtalking, adding a role which can talk to the dead, absorbing a dead player into another role, or just letting everyone deadtalk. I mean, these things haven't ever been done, and maybe with good reason, but there's no reason to close off the option in people's heads to start with. Perhaps the sticky post with his rules should be updated to make it clear that these rules are just a sample anyway.
tl;dr I don't think there should be a standard ruleset.
P.S. I'm not going to stop it going through or anything if everyone else thinks it's a good idea, and you're all free to discuss this or whatever, but I am pretty much against it...
[23:11:41] <@LightWolf> Oda rested on the seventh chapther, and saw it was good