Custom Scenarios and mods for ROTK 11

Hello,
I am a long time fan of ROTK 11. I just loved the battle system and the world map in which you could conquer. However, the game becomes very easy once you figure it out, even on the highest difficulty. Thus, I have been wondering if there were mods to this game to increase the difficulty or give it a refreshing change. I've been searching around and I have found some posts alluding to a custom scenario editor and other interesting mods. Is this true? Is there a simple way to change the game to add replayability? If so, could you please kindly show me how? I am a bit lost when it comes to modding a game, I would truly appreciate your help. Thank you.
I am a long time fan of ROTK 11. I just loved the battle system and the world map in which you could conquer. However, the game becomes very easy once you figure it out, even on the highest difficulty. Thus, I have been wondering if there were mods to this game to increase the difficulty or give it a refreshing change. I've been searching around and I have found some posts alluding to a custom scenario editor and other interesting mods. Is this true? Is there a simple way to change the game to add replayability? If so, could you please kindly show me how? I am a bit lost when it comes to modding a game, I would truly appreciate your help. Thank you.