Issue 1 - F5 won't support this because it's something that doesn't come out of thier tech stack. Simply is someone starts to use BIND and DNS on thier own. Your best bet is to put in a feature release with F5.
Issue 2 - I asked F5 support the same question about this quite some time ago for writing a script for a different reason, this is what they told me on the sequence.
bigstart stop named;bigstart stop zrd;bigstart start named;bigstart start zrd
Of course this causes a slight distruption, but that is what they said will gaurentee the changes.
/CB
Nimbostratus