new subblog admin not auto set as 'membership admin'

Hey there,
I noticed that when a users signs up on my clients multi-site, and a new subblog is generated, the membership panel (on that new subblog) is not accessable to anyone but super-admin.

I've taken a look at the 'membershipadmin' role level selector in 'membership'->'options'->'membership admins', and I see that the sites admin is listed there, but the box next to there name is not checked.

I could simply check this box, but it should be checked on site creation. I feel like I am missing a network wide settings to enable subblog admins default access to manage the membership plugin, but I havnt found it..

Any insight?