[tka]

>> 2. How did the Dev...
Oceania unit transforms to another unit, which is not stealthy, when it enters land.
There is not terrain-dependent stealth command, AFAIK.

>>4. Is #heal recuperation?
Yes

>>5. How do you mod units so that they are capital only?
Use units which can be recruited from magic sites. 'Halls of Andvare' or other national sites depenging on which nation you are going to replace.

>>7. How can I create and determine a nation's heroes?
Use replaced nations heroes. #selectmonster XXX and change their stats.