it would be cool if we could use a right click function to copy and paste asset tiles . It sounds pretty lazy but it would be pretty beneficial for those who want to make multiple tiles with very small differences
In trhe NESMaker treeview, you can duplicate an asset (right click duplicate).
In the Pixel Editor you can select a tile, and use CTRL+C and CTRL+V to another tile (and shift+ctrl+v... and select a tile then "V" or "H" to flip vertically or horizontally the selection).