Yeah, everything goes in the same place! "Kiseki-logs" is kind of poorly named because it's the old name when it WAS only a logs comm (back when the game was journal-based rather than community-based). But we do have journal entries (a few examples here and here, both start out video/text/journal but also some of the threads go into action but there's no requirement to keep it separate). We basically just kind of cross journal/action tags with little difficulty - as long as it's specified, people are usually quick to just roll with it. And threadjacking happens a lot, especially on entries marked as 'open to all'.
But you aren't required to post a journal. Some people are more comfortable tossing their character into a mingle post and having that be their intro, rather than write out a full journal entry. Some examples of that: here and here. But like I said, you're also more than welcome to do a journal entry as your intro.