AFAIK, the plugin only works if all tiles are the same size (i.e. using a map made in Ace for MV). My issue was coming from using Ace tiles in the same map as MV tiles (I want to use tilesets from the Rural Farm pack in my regular MV maps). As far as the sprite issue, there was a video on RPGMakerWeb's youtube channel about it. I'm not sure which one, but I've only finished the first four episodes. (Each episode is 3-5 videos long, so it might be hard to find quickly.)
I always see a few people asking for C# in next engine and I always thought: Do I not know enough about that language to tell it will affect extensibility and customizability to the negative? Watching a video from SumRndmDde today I feel confirmed.