In my experience in another game (specifically, luministi), having the option to use threads instead of a post for AC worked really well for the kinds of characters who tagged around more than they made their own posts. I remember seeing somewhere -- either on plurk or in this post, idr -- that one of the worries with increasing AC is that then everyone will make posts and not tag each other, I think the thread option would help -- that way, people don't have to make posts to pass, so it'd hopefully reduce post clutter and add more to tagging around.
I think the problem you mentioned -- that it would make threads move faster instead of encouraging new posts -- entirely depends on how the playerbase decides to handle the changes. Some people may be more likely to make more posts; maybe others will be more likely to tag around. It's hard to tell until it's actually implemented, which makes deciding something like that all the more difficult.
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In my experience in another game (specifically,
I think the problem you mentioned -- that it would make threads move faster instead of encouraging new posts -- entirely depends on how the playerbase decides to handle the changes. Some people may be more likely to make more posts; maybe others will be more likely to tag around. It's hard to tell until it's actually implemented, which makes deciding something like that all the more difficult.