A 93 Yes. A material does not modify the nature of a weapon, even if the material adds special rules such as being forced to take EWP.
A 94 RAW, no. Those are two different feats. Still, considering the flavour of Athasian Dragon, it would not be unrealistic to ask your DM about it.
A 95 Hard to say. Heighten Spell is not that well formatted. Some say that "as difficult to prepare and cast as a spell of its effective level" means that metamagic cost reducers are useless because they would reduce the effective spell level as well. Others say that you apply the feat first, then the cost reducer. Ask your DM.
A 96 Yes, it is possible.
A 97 discussion This is the RAW thread, and Mob is a template. The template's rules say that the mob only retains the special qualities of a single creature, and thus would Fast Heal as fast as a single creature. Yes, RAW can be quite unrealistic at times.