Instead of installing a million plugins to turn off features you don't want, why not use ONE plugin?
I tried to make it backwards compatible (that is, you can't disable the capital P in WordPress checker if you're NOT on WordPress 3.0 or higher), but I didn't bother coding anything for pre-2.8 WordPress. You should upgrade it you're not at least on the latest main version (which right now is 3.2.x)
In my rough testing, yes. It even works network wide AND in the mu-plugins, though personally, I'd let people decide if they want it or not for their blogs. Activate it network wide, let people decide how they want to impliment it.
Remember, EVEN if you activate this site wide, the DEFAULT per blog is for the settings to be OFF. So if you want them on for each site without the option to change, then this is NOT the plugin for you. Sorry.
Because as of WordPress 3.3 you really need this around to get stuff done.
Probably. Tell me what you want to add and I'll see if I can do it.
Start with turning off your other plugins. There are a few that mess with formatting.