Restart scenario with different difficulty

Hi I noticed you can’t restart a scenario with a different difficulty in original hon shadow of death. I played Hack and Slash and wanted to restart the second mission with a weaker oponnent. It is not possible. Can you implement it in VCMI? And do you know it if is maybe possible via an edit in a file in Homm3?

You can click on scenario options (where digging is too) and then select restart scenario to choose difficulty and start bonus. sorry