Sorry for the delay, i was on holidays ^^
For one of the questions : yes, there is a special wave if the main gate is destroyed
I run the game on ultra hight, this night i pushed the game to ~3200 units (according to the dashboard after the game) on the map without any crash before the destruction of the citadel.
By trusting in my past experiences, the game is very fussy with the RAM, either on world builder or in the game. I will use this week to see if there is a pattern of something else that may cause crashes, but because of the age of the game, i'm not sure of the results.
I know that keep with fire arrows are cheated, but well, if people want a harder version they can not build the stone worker
Here a version without any compression :
Uplea :
http://uplea.com/dl/FC58BCC1FBBAFA9Uptobox :
http://uptobox.com/g99jipnv1djaWaves :
1.1- North, middle, south : "slacking wave", 3 camps
1.2- North, middle, south : attack team, with towers and catapults
2- Nazguls, trolls capatults
3- Grond wave
Gate down : bonus wave (3- without grond) + Rhûn soldiers coming from north camp + south
4- Wall down : south, trolls, orcs
5- Rohirims
6- Mumakils + haradrims
7- Final mordor wave
8- Aragorn