I think a simple solution exists. Anything added/moderated in a journal does NOT affect your UID.
For example, if I get moderated "troll" on a comment in my article, it doesn't affect my karma at all, just my score on the article in the journal.
Also, if I post at -1, I can make countless posts within journals (not the now 'normal' 3 posts per day).
The only problem editors would have with this, is that journals would start getting more comments that front page slashdot stories...
I'm sure it won't get implemented, but its a good idea, IMHO.