Help with Custom spell

Hi, let me start off sayin' that this site is awesome and also that i'm new to using the editor. OK then, lets get started, follow along and please point out what i'm not doint / understanding:

1) I wanted to change the effect of the Shadow Hunters "Hex" ability from changing enemy units into critters to changing freindly units into Creeps.

2) So i created a new custom ability off of the Hex layout, and named it Mad Mojo.

3) Next i changed the targets allowed to ground, organic, non-hero and made the max level 5.

4) Then i took off the default critters and replaced them with steyr's (like the weakest to the strongest lvl stayr)

5) Now the problem i get after i use the spell is that the unit cannot attack.

Is this something i cant change in the World Editor? Or is it possible to get around this with a trigger or some kind of editor? Any help for this poor newb is much appreciated .

well you could use triggers and once the unit enters playable map just replace the unit with a stayr that does attack.

alternatively, you can use the dark conversion spell and edit the zombie to a creep, but this will only allow you to change them to one type of creep.

Especially knowing that Dark Conversion does not change the race of the targeted unit wich, on a different situation, would be a problem to convert ennemy to friendly units.

Regards