Wiki Plugin: Creating New Wikis and Editing Privileges

Hi there. I purchased and installed your Wiki plugin a couple of weeks back, and I have a few questions I was hoping you could help me out with.

1) How would a user create a new Wiki without it being a subwiki of another page? For instance, a user could click "create new" on this page, but when they do so, any Wiki they create will fall under Barton Alderman. Is there any way to avoid that?

2) I know that I can, via the Wordpress admin panel, set the editing privileges so that an individual Wiki post can be edited by "Site Users," but is there any way to make this the default for any and all Wiki posts?

I think those are my only questions for now. Any help you guys can provide is greatly appreciated.