@Ptarth. Sorry. Are you taking into account the simultaneous part of the combat ?
Anyway, I agree that it could feel kind of awkward and would require lots of planning - not to mention probably a large rework of coding. However, the "main" issue I see with that proposal is combat on a large scale, if everything happened at the same time in 2 different places it would be complicated to work out a system which would enable the player to understand what happened.
Anyway, whether it may or not be possible would not be my decision =), I'd have to work at Arcen to decide and I don't. And maybe it'll create some idea in Chris or Keith's head. He mentioned territories in another thread, and targetting territories instead of buildings, then having a combat phase sounds leagues ahead of what I proposed. This could also allow "replaying" last turn combat for each territory, and solve the above-mentionned problem of combat in multiple places (since it could be by solved by territory). Then again, maybe it's something completly different that he has in mind.
Looking back to it what I proposed in my 6:11 post sounds simpler, more intuitive and easier to implement for close results to a simultaneous resolution.
That said, if, possible, I'm more interested in gathering other opinions / ideas that debating that one - I know it has flaws. Could you share your thoughts ?