1) Do Elementalist Wizards suffer the -4 penalty to skill checks made to craft items with prerequisites from their opposition school like wizards that specialize in an Arcane School? The section on the Elementalist Wizards only mentions the need to use two spell slots to prepare spells from the opposition school.
2) Can an Elementalist Wizard use the Opposition Research (an Arcane Discovery) to effectively remove all opposition school restrictions by level 9?
3) Does the fire started by a Fire Elementalist's Fire Jet automatically go out after the first "following round" (after one subsequent application of 1d6 fire damage)?