I have started this thread to clear up any questions that kept popping up:

Q: Can I use Disintegrate Spell to Final Tile's Monster?
A: Yes

Q: Can I change my weapon / Magic Item DURING COMBAT? (ex : Sword/Shield to Two-Handed Sword, Spell scroll to Dagger)
A: No. You can only change equipment during the equipment changing stage.

Q: Can my Thief assign his 4 skill points to Melee Attack(maximum SR) AND CHOOSING weapon master experience?
A: Yes

Q: Is there any way to recover Magic Points?
Y: Yes, Potions. Normally a wizard would recover his magic during sleep. But as this is a short game you can only recover them by finding and using a potion.

Q: Does Fire / Acid / Electric Damage bypass Defence & Armour, same as LP damage?
A: Yes