Hi Pegli,
finally I find the time to answer your questions
1) The Shadow guards region 37. That's why it runs in that direction if possible.
2) From region 33 spirits move as follows (where [x] denotes the dice):
[1] 33 -> 31 -> 29
[2] 33 -> 30
[3] 33
[4] 33
[5] 33 -> 35
[6] 33 -> 35 -> 34
So in your example yellow moves to 35, blue moves to 30, green moves to 29, red and violet move to 34.
3) Yes. Boulders behave as usual. You can fight them even using the dwarves.
4) Every hero will receive a gem if he ends his day in the Gemstone Mine. And there is no limit in how many a hero might collect. Nevertheless, region 37 is quite unfavourable to end a day
I decided to translate this legend to English. Just in case.
When it's done, I will post it here.