Concerning the relief tiles:
Since at the moment, every map repository for use with the "download maps" function uses google sites, having upload-able file-sizes limited to 20Mb. This leads to problems with including relief tiles already for medium (the new WW2v4 Pacific) and especially larger maps. Would it be possible to make the engine look for relief tiles not only in the <mapName>.zip in the Maps folder, but also in <mapName>ReliefTiles.zip in the Maps folder? That would enable a 2-step download without further file copying.