Interested in making a .99 cent DLC for iOS QoM?
I'm thinking you change the final boss battle so that instead of slaying the dragon, you tame the dragon, who can then take you to another continent(s). Also, you could add side quests in the elf village ("I've lost my _______ go into the caves to retrieve it" or something) to help them rebuild, as well as unlocking the dwarf city (new weapons, battles in the mines)
There's obviously enough tiles in the tileset to make different maps (a dessert, or a snowy area, castle, lighthouse)
Plus you could use the Elathondréoth music.
If you get Silverwind's permission, I'd love to help you design it. The iOS port of QoM is so good, there's no reason you shouldn't make a bit of money off it.