Adding Page Delete Restriction for Wordress Wiki Pages in my site

Few days ago I install a plugin `Wordpress Wiki’ in my site for getting the light weight feature of wiki for my bloggers community. The plugin is simple to use and work fine to convert any pages to wiki. However, the problem is that according to the wiki style, anybody can edit and delete the wiki pages. I want to imposed some restriction of wiki page editing by following the wp user role, such as only allowed user (may be an editor/ author/wiki_editor) can edit and delete the wiki pages and rest of user and visitor will just view or read the wiki. The plugin has not some kind of user restriction tools. I try to use role scooper and such kind of plugin for create restriction but they failed to do that and made lot of code conflict in my site. The support section of “wordpress wiki’ is not much helpful and responsive for restriction issues. Is anybody in the forum who can help me about the page restriction issue?