My idea was to use the "passable" terrain (63) modified, so it would not be possible to block paths. In MM6 you can move anywhere, if you have fly and jump. If WoG version block the player on trees/bushes and mountains, then it will be possible to block the path with blue bubble monsters, but it will no more be similar to MM6, but different.

For example the dragons are very tough to fight. How many I put them in a bubble? 1? 20? In MM6 you can attack 20 and then lure one outside and kill him, then return for others. How to translate this in Homm?

In my random encounter idea, you had to fight one dragon at once, for a total of 20-30 maximum events in a specified area. The event is triggered by the hero movement, checking his position. At each battle in the area a counter is growing to a max of 20-30. Once the 30 fights were done, the area is free to visit from all sides.

Before I start to draw the map I need to be fixed on the "passable terrain" thing. This feature was NEVER used in WoG, as the script is considered stupid and useless by most players. This is not my case, maybe I can find an usage for it? Opinions?