I see no reason why units should not be merged.. They are very important part of everyones account. Some have mainly build army only so they can build buildings later.
About the peacekeaper role.. Well sure community can always try to fix what ever is broken. For me I dont think newbie protection is that broken that it needs to be fixed. Newbie protection is actually pretty fair. Since there is no way to demolish buildings and so on... Problems I see are not about having big, tech, big army and large bonuses from festival/buildings.. Problem is that once you have those and others dont.. awhile they arent that far away from your level.. you are way too unbeatable.
Its not about me having too many units that I had build and sweat for.. Its not about that others have too few.. Its about units that dont have enough roles so others could find other ways to defeat me than just by building more troops than I have.. What I dont like is that by looking at high score.. you ca see.. who is enjoying the game and who is not.