The hint is that
damage skills get
1) Power (which is the only choice for people that respect their chars)
2) Mana cost (lol)
Buffs
1) Duration (which is what you should do)
2) Cost (ridiculous)
you need to have your buffs all the same enchant number or they will not all last the same time, every time you enchant a buff for time it will last +40 seconds, a maximum +30 buff (which for now is quite impossible) would last additional 20 minutes (total of 40 minutes buff, neat)
Dances/Songs
Same to buffs, the only changfe is that they get +20 seconds per enchant for time. Neat, this means a dance of +9 (which can be done when you reach 78 lvl easily) would last +3 minutes. A maximum enchant of +30 would make the dance/song last 10 more minutes... awesome
Debuffs
1)Cost (ridiculous once again)
2) Chance (your choice)
chance will upagrade the skill's base lvl and also it's base land rate.
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CT! and forth
there are even bigger options, with the new elemental enchantments on weapons most skills get and upgrade in elements usually.
e.g. huricane can be 1)Cost, 2) power or 3) enhance wind attribute (that makes some sort of debuff to the opponent or something)