#1:Correct. Re-rolling 1's and 2's on smites is the point of contention. By RAW you can. RAI clarification says you can't.
#3:Disciple of Life requires a spell that restores hit points. Goodberry creates berries that restore hit points if used in the first 24 hours.
goodberry->healing berries->healing
vs.
cure wounds->healing.
Whether or not this makes a difference is up to a DM, but unlike Pex I don't really care about that. It's a very silly trick that you have to deliberately build into. The arguments for and against it have been hashed out in the thread.