ultimate branding logo links to netowork admin site

I am using Ultimate Branding on a multisite install. How can the following be addressed:
1- The branding login logo image from the network admin site appears on all subsites. How can each subsite have its own login logo?
2- The login logo has an HREF value, which when clicked from a subsite login page, links back to the network admin site, rather than the subsite home page.

Please advise.