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There is an option to automatically do it, but no option to disable it. This is important in the case where not even text mode works, but you can pass enough data at boot time to start a VNC install. If local media is discovered the media check box pops up and stops the process.
Is this a kickstart install with the mediacheck command, or is the option being passed in from somewhere else (pxeboot args, etc.)? That screen should be guarded by a check on flags and I don't see that it gets unconditionally enabled somewhere.
Oh, now I see it. Of course there's two of everything in loader.
I noticed that if you simply want to disable the mediacheck without actually using Kickstart, it is possible to specify this command line option: ks=file:/dev/null
Will's noloader branch will completely remove media check from the path up front where you have to decide whether you want to do it or not, and in the newui it's an opt-in thing.