Mr. Papa, not sure if you committed your changes or not as mentioned in other thread on this topic, but it seems after a svn up I still see the double link.
svn 6918 as shown:
no, I said for ‘upgrade’… didnt know it was also an issue for install as it was reported for upgrade… can probably apply the same fix though…
fighting a bigger issue with my multisite install now… may have to start it all over…
Confirmed. Now one Install Simple:Press link showing.
Yikes about the start over bit 
yeah, the multisite test site was early 5.0… before the alpha we cleaned up and reorged the upgrade script… so when I tried to upgrade this early 5.0 site, it missed a lot of the needed upgrades… whoops…
tried to do manually and just trashed my db… now, need to start ms from scratch… but cant remember how 
got to find those ms install instructions… 
My SP multisite install is only on blog1 (main), so as far as I can see all is (or seems) working well aside from those hiccups a while back.
Please let me know how I can help you when you’re ready to dive in.
oh just time…
they still dont have an efficient multisite install like standard wp… still manual stuff to do…
I had three sites, the main and two network sites (two with sp) with handful of users spread across them… and some profile and topic stuff… just test stuff… but was useful… argh!