A new set of IOs: Damage/Secondary Effect
Anything, as long as you change the 'blaim' in your signature. The Grammar Enforcer within me is crying on the inside.

It sounds like a good idea to me. For the numbers and lay out you might look at the knockback sets which are:
Damage/knockback
Accuracy/Knockback
Recharge/Knockback
Recharge/Endurance
Damage/Endurance/knockback
Accuracy/Damage/Knockback
Accuracy:47.7%
Damage:68.9%
EndDiscount:47.7%
Recharge: 53%
knockback:173.95%
Obviously the secondary effect's percent would change based on it's schedule.
One set of IOs that would make perfect sense to add would be sets that affect both the damage of the power, and a secondary theft. I could see these sets using more triples and quads then ordinary sets, because of the limited use. In example:
Scirocco's Shock:
Damage/End/End Mod.
Damage/Acc
End/End Mod/Recharge
Damage/Recharge/End Mod
Acc/Rech
Damage/Recharge/End/End Mod
1- 12% regen
2- 2.5% hp
3- 2% recovery
4- 3% damage
5- 3% resistance to energy
6- 5% end resistance
Note- This is just an example. I haven't looked at the numbers on the set, so if they suck they could easily be moved around so that they are better balanced. Ideally, I'd like to see these sets follow a general outline of:
95% damage
20% accuracy
20% recharge
25-30% endurance
50% secondary
I also would suggest that having resistance to the affect as a teir 6 set bonus. This would be both thematic and and unique.
TW/Elec Optimization