The /Extensions/Install Module

addUserDefinedRole(self, role, out) [#]

Add the role 'role' to the plone root
http://www.zope.org/Wikis/DevSite/Proposals/ExistingUserAndRoleAPIs

install(self) [#]

Install PloneSVNaccess

Install skin
Add the new Roles
Install PloneSVNaccessWorkflow
Install PloneSVNaccessTool
Add PloneSVNaccessVersioning to Member Data