Oh, no you can't edit the SHAPE of the ear, just the size. I bitched up a storm about then when making my self sim. I have very "stick out" ears but they're not really LARGE. There is no "stick out" option for sims.

If you're trying to get the gnarled ears, maybe take a sim that has them and use them as a template? Or you could breed sims in CAS and export their children back out and use the children as templates. Again, it's not the most direct route but it might make for some interesting results.