In the modules/gwiki/extras folder of the distribution, there is a customizable wiki script called gwiki.php. It can be used to put the wiki content exactly where you need it. At the head of the script you will find the most needed customizations. Start by placing the script where you want to call it, and give it the name you want it to have. The next critical step is to adjust the include_once line to locate your XOOPS installation's mainfile.php. You can also adjust what the wiki module directory is called, what variable carries the page name.