I think my previous post on page 1 might have been missed by some, because it contained a discussion-worthy idea (I thought). DaveF is looking for something harsher than temporary bans, but not as harsh as permanent ones, so that the mods/staff have more options to choose from when they're considering what kind of punishment is appropriate (at least, that's my impression). I like his thinking, because I believe that bans (especially permanent ones) usually just lead to new account creation and ban evasion, anyway.
So, I think a new type of punishment that is harsh
but doesn't incentivize new account creation is a good idea. One type of punishment I can think of that would satisfy both constraints is de-ranking (by way of "activity reductions"). As an example, let's say that a "Sr. Member" (with 300 activity) plagiarized something and instead of the mods banning them, they decided to reduce that account's activity from 300 all the way down to 30 (sending them back to "Jr. Member"). On their profile, activity might appear like this "Activity: 30 (+270)". Because everything else about their account is left intact (merit, trust feedback, etc.) I think it's very likely that they would keep posting under that account and wouldn't abandon it for a new one. You could even make the "reduction" temporary in some/most cases, so that mistakes that people have learned from don't end up haunting their account forever.
I suppose it covers some of the same ground as signature bans do, but it's a little more configurable (e.g. reducing an account's activity by just the right amount would still let them participate in campaigns, but only at the lower tiers). I can imagine scenarios where all of the types of bans that I'm aware of (temporary, signature and permanent) would lead to new account creation. But with activity reductions, I think the mods would basically always be able to find a pair of values (how much activity to remove, and how long to remove it for) that would leave the account in a state where it doesn't make sense to abandon it.
I know I've previously said that I'm
against de-ranking, but that was in the context of Fivestar4everMVP's idea of reducing mindless posting by penalizing people for not earning enough merit within a given time window. As a punishment for offenses that would normally lead to bans, I think it's an idea that's worth serious consideration, especially because of the positive effect it's likely to have on account "churn" and ban evasion.
I'm also a little interested in what other options this style of punishment might open up. For example, tiny offenses like multi-posting (which I've done once or twice myself) being handled by removing 10 activity each time it's done, would put an end to it pretty quickly, I imagine.