I am trying to make the best possible load out to use runes. Here are some general questions I have.
Which type of magic makes for the best Rune? Fire, frost or shock?
Are Runes effected by perks? As an example, if I have Frost enhancing perks, with an enemy be slowed after triggering my rune? Will he potentially desintegrate at low health from a shock rune? Will he be staggered if I have the Impact perk?
How much more poweful are dual cast runes?
Hmm, you're probably not going to like what I have to say.
Runes are extremely weak at the higher levels. They are intended to be used at sort of the mid-range of the game. Since destruction spells do not scale at all and there are no upgraded versions of spells, by the time you get to the end, they are incredibly weak and nearly useless. To base a character design on them would be a mistake at this point.
Here are the rune spells for review though:
Fire Rune - Cast on a nearby surface, it explodes for 50 points of fire damage when enemies come near.
Frost Rune - Cast on a nearby surface, it explodes for 50 points of frost damage when enemies come near.
Lightning Rune - Cast on a nearby surface, it explodes for 50 points of shock damage when enemies come near.