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Intention was to boot Fedora using grub2 (Debian) and hence using /boot on an LV would probably work. Anaconda does not allow this. My request is to be able to override anaconda's sanity check.
I ended up working around the issue by first placing boot somewhere else and then cloning it back onto the LVM (and using external grub2 to boot fine). Just thinking there should be a better way to do this.
anaconda is really not designed to make use of another installed system's bootloader like that. We don't go digging for other bootloaders, and we don't take their partitioning requirements into account. For now, the Fedora x86 bootloader is grub and that's what we are going to write to. That will change to grub2 at some point pretty soon at which time this will be fixed, but for now not.