Specific Skill Upgrade Script

So I'm looking for a certain type of skill upgrade script. I tried out Kread-EX's and a few others but they're not exactly

what I'm looking for (not to be rude of course). Basically what I'm looking for is this:

Let's say I have a healing spell called "Heal". I would like to be able to choose my upgrade out of a list

of several different upgrades. We'll say I can upgrade how much it heals for. Or I can upgrade it's cost, and by that I

mean lower it so it's cheaper to cast. Another option would be I could choose it to add a state, Health regeneration for

example or maybe a defense-up buff. Or I can just power up the skill itself and increase something like it's critical strike chance

so it's more likely to get a critical hit after choosing this option.Rather than the upgrades consisting of just adding "x" damage and

costing more to cast. Each time I upgrade something, it adds a level to the skill and of course costs me some sort of currency. 

I hope that all made sense! If anyone knows of any script like this or has one, I would appreciate the feedback! :D