As far as I watch MLB and its umpiring here is how I understand this.
1) As long as it is what he normally does and is not a change used to deceive someone they normally allow pitcher to get away with it. K-Rod is not the only one to get this "courtesy" I know one of the Mariner relievers does the same thing and doesn't get called, it even gets mentioned once in a while.
2) Early in the season probably not, but after about Mid-May most likely he would as it would be understood by that time it is his normal motion.
3) Unlikely, the balks I see Davidson don't involve not stopping, he calls everything else possible, but unless blatantly horrible I haven't seen him call a borderline "no stop".
Jasper
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