im just really curious is to how useful that week i spent training restoration was worth it or not ... such a slow and dull week ...

also are there any perks that will up the power of my destruction spells ?

in the perk tree for destruction there are perks that will up your destruction spells. Restoration is very useful for me and I'm playing as a pure mage.

is there any super bonus for completing a perk tree ? or can i ignore distegrating corpses for level 70 destruction

learned that ash piles dont fade away juts like fall out 3 ...

No, you don't get any kind of bonus for completing a perk tree.