Yep. Just change all of them. Make a backup copy before you do just so you have the original values and in case the patch decides to get picky about modified files.

It's not necessary. You modify the "DynamicAvoidance*" settings yourself in file C:\Program Files\Electronic Arts\The Sims 3\Game\Bin\Sims3.ini

Either half them from the defaults as JBoat did or just set them totally to 0 if you don't mind them completely walking through each other.

I simply cut the values in half (from defaults) which is quite realistic enough, and alleviates most of the traffic jams I see in-game.

You know, I had really hoped that "enablellamas" would have given everyone llama heads or something similar. 

In any case, new bug...or something to report.  KagomeSim had her baby (which turned out to be a boy, and thus he was named Kouga and given the insane/neurotic traits for the hell of it), and when his bladder got low enough, I changed his diaper.  And changed his diaper.  And changed...you get the idea.  She went through the motions sure enough, but the bladder level never filled.  Instead I gave up and pottytrained his little ass instead of letting him become a stinking mess. 

It's pretty RIDICULOUS for the lifespan slider to only affect the sims you are playing (I did read that it's a per-sim setting) because the whole POINT of the whole hood getting on with their lives is so that people are growing up at the right time to match your in-play sims.  If not, we're no further on than we were.  Unless of course we always play with default lifespan.