You cannot do that. Tile sheets are a predefined size and format, and the ones that come with the engine are at the correct size. Only RMXP allowed you to add more rows with more tiles.
If you want to add extras, you can either create new tile sheets (you're only using slots B and C there, so you could create a new tile sheet for E - it would need to be the same size as B and C, even if the majority of the tiles were blank), or remove unwanted tiles from the existing tile sheets in order to free up enough room to add your own (if you do this, create a copy of the tile sheet rather than modifying the original, and make your edits to that, and then use the new, modified tile sheet in the Tileset tab for that map).
So I figured out how to put words and pictures in the screen transition. It even wipes away from both the top and bottom. The possibilities are endless! I'm going to devise secret messages now for them because I'm a terrible wonderful person like that.
December has arrived and with that, an ¡update for Aletoir Feast! a game made it for the One Map Challenge. I will use some of the remaining switches, variables, and events from the challenge limit to add more content but keep it within the requirements. ¡Have a nice day Everybody!
It seems MOG Weather only has a "clear" function to instantly erase a given weather effect. Probably works well if weather only changes at map transfer, etc, but looks very abrupt if weather effects are continuously changing. So my next challenge: script a "fade" function to gradually fade the sprites and wait to "clear" the current weather until the opacity of all its sprites hits zero... or something like that! XD