Maybe if simply using allowable targets doesn't work then maybe you could create a buff which increases damage by x% and then just simply select all your specified targets and give them the buff when the ability is in action.
Yes, wards are wierd like that, alot of stuff doesn't work on them. What you may need to do is make all your wards units, just look and act like wards?
I do know this - xenforo dropped the ball by not keeping the vbulletin reputation comments as a feature. The loss of the Reputation comments data when we switched to Xenforo really was the death knell for the site when it came to all the users that left. I know I missed it so much and I got way less interested in the site when that feature was gone and I run the site.
I'm on a page about incorrect corrections, and spent the better part of like two hours trying to get someone to understand that -5^2 = -25, not 25, and then that post had comments get reposted because that group is self sustaining, and that person was in turn trying to explain what I just explained to them. And I'm taking that as a victory