In the Gods and Magic book, the twenty major Gods each have a paragraph that allows minor modifications to their divine casters.
Ex: Erastil's clerics and druids are all proficient with shortbows and longbows. As well, some spells are usable from other caster lists.
Ex: Sarenrae worship allows for clerics to pray for flame blade as a second level spell.
Is this legal for PFS play?
For now, no. I am opening up additional material from that book in 2.1 of the Guide book, but I haven't settled on exactly what is being opened.
I will be awaiting with anticipation version 2.1 -I know, in the next few weeks :)