[Mythotical]

Ok I never suggest keeping cmps_index.php, change it to index.php, move it to your mysite.com/ directory and delete cmps_index.php from /forum/ directory. You should be able to access it the way you want then.

At the same time, you would need to add a new module through the admincp and make a new custom template with whatever you want. Move the module to center area and your done. Easier said than done tho.