I am fully for treating new people with respect, even beyond what they are due. There is no excuse for sassing or mocking or yelling at anybody. Just let me know if there's a problem. There are guidelines up at the top of the page, and they've probably helped where they are going to help, but with the others, it's not appropriate to come down hard on them. Be polite when you reply or click report to moderator if you don't feel you can do that and I'll handle it.
I don't think mandatory anything is really going to stop the redundant posting, though it might dent it a little. Many double posts contain willful acknowledgment of a refusal to search, so the rules are being read. I don't know how to change the forum software to make searches forced, and I'm not even sure it's a good idea, since it seems abrasive. I think mandatory user tagging will work for everybody except the people we are concerned about. Even harsher enforcement of rules with sanctions won't matter, as these are (generally?) first time posters that create a single redundant thread. Moreover, it's a large investment to get up to speed on what has been said about magic, for example. It's not realistic to assume somebody will read everything that has been posted at this point. A redundant post only matters if it stays on the front page.
Regarding subforums, people reference what I said before, but I don't think anybody there or here has replied to my objection at the time, which is that this forum's search function does not respect parent-child relationships (I've tested it on nonsense, and it doesn't work). You can force it through Footkerchief's failed-search-with-options-link-things, but that doesn't fix the top right search bar.
I think it's important to address the larger concern, and this isn't to stop redundant posting as I'm reading this discussion. The question is, what more can we get out of the forum structure for the purpose of collecting ideas on highly active topics in the most refined and Synergistic way so that people genuinely interested in building on what already exists can contribute novel material? Even in a system with no redundant threads, this issue is not addressed, as various related ideas are still not connected unless people are willing to do some massive forum diving, which isn't going to happen in general.
Let's work with the single stickied index idea a bit, and say it indexes non-stickied summary threads for any active topic with more than a few redundant threads. If the summary threads are living off in their own little child forum, it might keep the front page cleaner. For especially active/broad ones like magic, I think it's important that the summary threads, as Eagleon points out, be receptive to linking from the OP to side discussions that might spring up in additional threads, rather than trying to work within a single megathread framework. The summary can link to any active and categorized discussions. This requires effort and dedicated OPs, but with links in place, it's very easy to help redundant posters along if you like. As somebody suggested, a template could be provided there to copy-paste in your message if you want.
Now, for most topics, this won't be necessary at all. There will be single threads as there usually are. I don't think there are currently so many redundant threads that discussion on any topic is impossible (in the sense that redundant topics fill out the front page), but I think the added structure would help a bit for those that are talked about a lot. In the end, if a thread is truly redundant, and there is one single nice person posting a link, it'll drop off the front page rapidly, and a glut won't be possible unless this place gets ten times as many people. At that point, after the nice person says something, threads can be locked and/or deleted, and I can send them a nice PM or something. I don't know. That's way far off.
Something like Felblood's
index thingy would be part of the process, but just linking to something like Underground Diversity wasn't what I'm getting at. The Underground Diversity summary would somehow need to incorporate other discussions that come up, if Eagleon's saying he doesn't feel comfortable posting in a single thread like that. I dunno. Getting at all the magic threads into a summarized form that then links off to whatever people are talking about and then continues to build that into the summary sounds like a pain in the ass to me, but the lack of that sort of structure is what I hear people complaining about here. Not so much the redundant threads themselves. I haven't decided on anything, so please don't start creating anything now. I'm not sure if the best system might not even involve me being the one OPing those threads. It depends.
A/the wiki would probably be better for that sort of interaction, but as the wiki is more easily mutable and not under my control and not as easily checked for newness, I would not be able to use it easily for dev. People have suggested specific dev-suggestion-management software in the past, I think. I'm not sure if it's time to revisit that. My current routine is fine for me... I think the concern is that you guys aren't necessarily enjoying what's going on suggestion-wise, and don't feel you are able to put your best into helping me make the game better, or however you want to say it. The only extent that I need to be thought of is that anything I refer back to needs to be under my control and relatively static, or it's worthless to me as development notes, and new suggestions need to be easy enough to catalog (the current system is fine for that). The main thing about the SMF forum that's convenient is that we have some people that understand its inner workings, it has a lot of posts and I feel comfortable with it.
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Regarding the red necro text -- that is SMF, not me. I don't even know if I can turn it off for the suggestion board.