[Foodstamp]

1. You can do this by using #copyspell to copy one of the spells that already do this (Such as Tartarian Gate). Then you have to overwrite the monster slots that the spell calls to. It's not elegant, but it is the only way I can think of to truly randomize what you get.

2. Domsummon20 won't produce units at lower dominions level.

3. You could give the unit #stealthy 0. I don't know of another way of doing this and it does make sense that a visible unit would be killed on sight in an enemy province.

Goodluck!