Yes, as of SourceForge 4.3 Hotfix 5, it is possible to add your own custom links to the Quick Links section of the application home page by editing file sourceforge_configuration.properties.
To do so, simply open the file /usr/local/sourceforge/sourceforge_home/etc/sourceforge_configuration.properties and add the following:
quicklink.link0.text=Your Descriptive Text Here quicklink.link0.url=http://www.yourcorp.com quicklink.link0.description=Detailed but succinct description of the link
After saving the file and restarting SourceForge, your links will become active. To add additional links, simply increment the link0, e.g. link1, link2.