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Thanks to everyone for their opinions!
We will definitely play on the well-tested and reliable version of the 1.7.8 templates, which are posted in the first post.
We will not prohibit jumping through thin walls, although this is more of a bug, but it is difficult to control, and the chances of getting this bonus are equal for all players.
It's more complicated with the Orc, but I think we'll try to allow resetting the spell, because this is more of a feature than a bug, we'll collect statistics, and then we'll see.
I will make changes to the rules.