1) cut the percentage of imbalanced special abilities that have no equal — offense, armor, log (if in a duel between equals one gets a hero from this set and the other doesn't — most likely гг because "he just got lucky, Tazar walked into the tavern")
2) move TP/Resurrect (or both) out of the Earth school, DD out of the Air school (in magic, more absurdities could be reconsidered)
3) buff useless special abilities (this was done in WT, and it improved the game).
It is not necessary to make this part of the official HotA "for the plebs." I am talking about something needed as a Tournament Edition option (I really like this term).
Why specifically as an option — for the same reason why not everyone plays HotA. Because it's hard for people to master the changelog. And it is clear that just as CIS tournaments were started by the TE crowd and continued by WT — such events should be played on the most hardcore, highest-quality version of the game from a balancing perspective.