Additional Admin & Mod permissions - Edit member's messages and locking comments (like in forums)

1) The ability for Admin or Mod (when given permission) to edit members' messages. My server is starting to grow, and unfortunately, not everybody follows the rules that have been implemented. Instead of 'warning' them all the time or having to kick them out, simply editing their comment and informing them would be a better option if Admins or the founder of the server has that permission.

2) The ability to 'lock' a certain comment or comment (from the 1st to the one wished to be locked) would be cool. Like forums such as proboards etc., how you can lock that thread when it gets out of hand, I think having the Admin's or Mod's being able to lock that comment and show other members that this can happen and would happen would be a nice feature.

3) Color fonts? Could this be done? It can come in handy when you need to describe certain types of things or rules. A few colors would do.

Especially for the first 2, being able to edit other members' comments from an Admin point of view or Mod would be a nice addition.