The nice things i want are always too much work. lol
Would new "joints" help, you'd have two and you can use them to indicate where to split the creature, if that makes sense.
The muscles would only initially have the same values, after that, it can evolve just like it does now, it would only have a symmetrical start.
Setting muscle values manually sounds very nice but then, as you said in another thread, it's not really evolving on it's own.
Oh well, it was just a thought and i already knew it probably wasn't going to happen any time soon.