Current questions and answers regarding the map editor.

I don't play on an arena, but on my own map.

Well, I didn't specify which arena, my own or not ;)
It's possible, but I'm afraid there will be a small pause between them.

Does anyone know the spell_id for the spells in the Tribes of the East version? I asked recently, and I was given a link to the forum archive, but it only contains the IDs for monsters and artifacts.

[game folder]/Editor Documentation/HOMM5_IDs_for_Scripts.pdf, section spell IDs (page 5)
There is also a file [game folder]/Editor Documentation/HOMM5_A2_IDs_for_Scripts.pdf, but it is less complete; it doesn't contain items from Tribes of the East.