I would like to start off by saying I like the concept of the realistic dominion event although I can't get in to PvP or AI versions unless I turn matchmaking off on AI mode.
That said, I was given to believe that the duel practice was being overhauled so you could select which hero you want to practice against and at what level. Is this still on the cards? It would certainly make it easier to read the different characters body movement with a bit of practice and perhaps you could have option of turning off guard stance markers too?
Currently I'm using custom matches to practice but I think the duel practice arena will be a better option for continuous practice.