Sudden winds, Framer and de facto
Yes you are correct in respect of entering predictions for anti-ice use in the FMC. If your predictions are correct then you will save fuel. So I stand corrected.
Regarding APU use after landing - yes we do have SOP's but they are vague in wording. The essence of the wording is that APU starting should be delayed if a long taxi is expected.
Regards
Exeng