This is really not that hard to do already. Use your email alerts to follow only the threads that you want to follow.
Are you getting email alerts to threads you've created or replied to?
I will post new threads, read a few and reply in various forums here, and continue doing so until I start getting email alerts. At that point, which is usually after participating in or creating several different conversations, I'll just start using the alerts, clicking the links in them. That keeps me pretty busy, and doesn't require a lot of effort skimming through the forum lists.
Get an alert, open it, click the link, reply if I want to, close the tab, trash the alert. Repeat until all alerts are gone from the inbox, return to the site and create more havoc for myself.
Beware though. This method can eat up an entire day in just a few minutes if you're not careful!
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I'm not likely to be around much longer. As before when I first signed up here years ago, I'm finding that after a long hiatus, and after only a few days back on here, I'm spending way too much time here again already. So I'm requesting my account be locked, banned or whatever. It's just time. Until then, well, I dunno...