[Users] oVirt run once Linux boot options

Hello, I am wondering howto use this feature. Is it possible to install server from this dialog? I specified kernel and initrd path as http url to our spacewalk server and to kernel parameters I added ks=http://spacewalk.server.url/ks.cfg, but it did not start. Is it possible to connect oVirt with spacewalk 2.0 (redhat satellite 5.6) to provision servers? Thank you.