I come from the board wargame side of things and play Advanced Squad Leader. Although BA is certainly much simpler than ASL it's quite a good adaption of the predecessor Squad Leader and is convincing in what it does portray. That the buildings only have one level is cutting down on possibilities and since in WW2 there were many fierce fights within a single building (just think about BA going Eastern Front, which is something many players I'm sure, are waiting for, and then you have a Stalingrad scenario and no fights within buildings...) that should be part of the game imho. It would be as in ASL, you have buildings with just one level, with two and 3 levels. That would change LOS and would allow a city/town to have some specific advantages/disadvantages compared with a different town on the same scenario map. Flags could be located on a certain level of the building and the players would have to fight their way not just into the hex but into the location of the flag. Or if done simpler, the flag would still be the hex but would only count as conquered if all levels in a building located in that hex are 'clear' of enemies. In a three level building LOS would only be between adjacent levels, so a unit on level 3 couldn't be attacked or assaulted from the basement. A unit in a level three church would dominate a town or could have better sniper range or better recon range and to blow away the church tower with a tank would become an important part of the game. It's not necessary to actually blow away that level, but the unit could be targeted by the tank on that level etc.. It would be easier to see what is possible if you could check the ASL rulesWe have no plans for multi-level buildings currently - although can you be clearer about how you think they would function (perhaps start a new thread to make this one easier to navigate for the dev news).
Just thinking you know, the game is so great in what it does that smoke (which is on the list as you said - good!) and multi-level buildings is the only part that's really missing


