I would have made changes long ago but The code was frozen long ago current AH release. And hence what would be a simple change under normal conditions now is not doable.
I think this is the most important point, which I've seen HT bring up just once before in a recent "change the damage/hardness of the HQ to keep the dar up" thread. I'll admit that it surprised me, as like most everyone else, figured that if players/CMs could change things in the SEA so easily, it must be a snap for HTC to do so in the MA, and HT is just resistant for reasons xy and z to bother changing it. Then HT responded (at last) and said that if it was an easy fix, he would absolutely have done it already.
This is what many I believe didn't and still don't understand - I was certainly in this group as well - that assuming ANY kind of change to the game is simple and fast. Apparently it isn't.
So, IMO it becomes a choice now, do you want HTC taking time away from new initiatives to fix the old game, or not. Pretty easy choice to me. I really think any complaints about the gameplay are pointless now, and have been since the announcement of 2 things - the new alpha being worked on, and HT saying that it's a hard time consuming fix to change little things that he himself has said he agrees with and WOULD change, if they were easy.
As for the OP idea - That is pretty much what the AvA is. It still amazes me the AvA is so dead, if there is one thing I would get motivated to still play, it would be a daily arena set up in some historical scenario in an MA type style with just 2 sides. Yet it never, NEVER happens, I've not once since it's inception seen MA numbers in there. And that sucks, and I don't know why. I just wish it would be populated is all, I don't have any ideas or answers either.
I do agree that a test server and open forum associated with it isn't a bad idea, other large successful sub games have had this sort of thing, either one or the other or even both, but again back to the original point, I'd rather wait until the new game is up, running, and established before starting any campaign to get HTC to work on something like that.