Set number to display in Wiki Widget


I have two questions regarding the Wiki Plugin.

1. I created a Wiki. I added the Wiki widget to my sidebar. The Widget is displaying only One Wiki page link. Is there a way to set it to show some variable number like 5 wiki page links or 10,15 whatever?

I created a Wiki. I then created 50 "Sub Wiki" pages under that one Wiki. The Widget shows the main Wiki Name and just 1 of the Sub Wiki pages.

2. Each Wiki Page can have Sub Wiki pages created under them.
I only want the main admin, ie myself to be able to create sub wiki pages.
Is there a way to mod the plugin to do this?

Thank you,