I'm trying to get an autonomous sim going in Life Stories, but the social interactions are incredibly boring: meaning that one sim just spams 1 interaction until it's time to go to sleep. It might be Congratulate, infinite times in a row, or Admire. Is there some mod or adjustment that can get the sims to realize that their conversations need not be the same phrase repeated by the same sim infinite times?

Twojeffs has a fix for the congrats madness specifically:
http://www.simbology.com/smf/index.php?topic=13.0
I have it in my regular game but haven't tried in LS, it should be OK since it's NL or higher. I would make a back up and then try it.

For annoying repeated interactions more generally speaking, Cyjon made a loop fix:
http://cyjon.net/node/123
I haven't tested that one in LS either, or the Smarter EP check mod which is required for this one to work.