I'm sure these questions must have popped up before, but I couldn't find them when searching, so here goes:
1/ If a character uses an item to cast a spell, can they use Spell Enhancement beforehand to alter the effect of the spell from the item?
2/ Likewise, can they use Spell Mastery, if they have a skill in Spell Mastery for the list the item spell effect is from? Example, they use a Wand of Fire Bolts to cast a Fire Bolt - can they also use Spell Enhancement and/or Spell Mastery to then increase range, damage, etc. of the resulting Fire Bolt?
3/ Can Haste spells be affected by the various Extension spells from Spell Enhancement? It seems clear that Haste I *can* be. But, Extension spells only affect spells with a set duration (and the rulebooks explicitly rule out 'concentration' and 'instantaneous'). Haste I has a set duration (1 round). Haste II and up have 'varies' as duration, so, can they be affected by Extension or not? - There is no clear ruling that I can find.
4/ Why am I asking all this. Well, after many years of adventuring, the group's Magician is now expert enough in Rapid Ways and Spell Enhancement to cast 100 rounds of Haste or even more. And he has an item that casts Haste X Daily I - so if he spell masters and spell enhances spells from that item, he can manage over 200 rounds of Haste across 10 targets. If he uses Greater Extension, then technically he can give 10 targets 12 hours of haste. The entire PC group go into most major combats effectively with haste-for-the-duration.
Yeah I know as the GM I can simply say "nope - I'm not having that", but a clear ruling would be useful (if, for example, Extension spells *don't* work on 'varies' duration spells).