First question: Madden once posted a world called Filed of Wonder (he later renamed it to something I can't remember). It had very nice grass in it that you may be able to use, just be sure to ask him (if he doesn't answer, just use it and credit him).
You can download it here:
http://maddenuser.webs.com/apps/links/
Second: probably too many loops running simultaneously. See if you can streamline the walking methods, and if you can't, just put in a block which prevents two motion keys from being held down.