You probably saw the post about sudo's banning earlier, but if not:
/u/zombie_berkman banned /u/sudo in /f/armed_left for a comment they made in /f/meta. /u/zombie_berkman interforum-banned them for breaking /f/armed_left's (informal) rules on a completely different sub-forum.
That's eerily similar to the situation on PK leftist subs on reddit-- if you say something a mod disagrees with on /r/socialism, you're banned in every sub they control. If you comment in a subreddit they don't like, you're, again, banned in every sub they control. Break the rules in /r/eddit, get banned in /r/leftwithoutedge.
That's a really shitty setup that can ultimately allow mods to entrench and shape communities with hardly any justification-- "you might not've broken the rules in my house, but you broke my house rules at town square!"
Each sub-forum is its own community with its own rules and standards. Having sub-forum rules be, effectively, "site-wide" (as far as a moderator is interested in patrolling everything else) really doesn't make sense.
For transparency and preventing mod overreach, I propose that IF-banning be disallowed.