Very much agreed could be alot of different special used for upgrades on mains ability,in response to your opinion on continuous rage,i have also thought about that for quite some time. but when you look at it like this,continuous rage isnt going to be something people are going to get fast you will have to make decisions day by day on what you sacrifice or not sacrifice towards these upgrades. and we have quite a few more heroes that are going to be released in the future (with more possible better special attacks then there are now) so having it like this can help you to keep some of the specials you like in your form without taking a extra hero space in your formation. and also,if someone else has a continuous rage chances are you might also have it,as every player can pretty much sacrifice at the same rate it is your own decision on what and when you sacrifice. but yes it could be overpowered,but balanced out and still strategical in the sense you can still be negated by a shield wall or stunned etc.
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