I've been tossing around some thoughts since reading the obfuscate code question and it made me realize that part of the problem with any 'dark' theme/setting is that it doesn't really translate well to MUSH. Maybe we've lost that 'edge' that made games more immersive in that fashion, maybe we're trivializing things that should be focused on, I don't know, but I thought about ways to ramp things up and was curious as to how many other ideas might be out there.
One of the things I was thinking about was adjusting the jobs system so that it would announce to participants that there was activity in their jobs via @pemit, maybe even in a different color so it stands out.
Then you could make up a job that was directed towards someone and just ask them to roll something, like, perception for example, to the job. Then you just leave it alone, never touch it, they will wonder why you asked them to roll perception and you can answer: No reason
Their own imagination will do the work for you, and then they might actually start investigating something just out of paranoia, which would generate RP.
You could randomly drop stuff down on people. Just bam, something happens to random people who are anywhere IC out of the blue.
You could still have meta things going on of course, but even these few little things (I feel) would help make the game world feel /alive/ rather than a world based on the +events calendar.