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I'm creating a level with PLE and I have found some problems.

-How to place correctly electric walls and rock stacks?

Use the in game items and see how they're placed

-Is there any differences between Half scale and 3/4 scale? (I have found objects in background with mixed scale)

Don't know

-What are 5 unknowns of the collision items? (some moving bombs have the collision items with strange numbers)

First is type (0 floor, 1 and 2 walls ect...) and others just write -1

-How can I use a gas emitter without a counter?

In AO you can't

-How can I activate something when I use a hand stone?

In AE

-What is the "DISABLE RESOURCES" property and what have I to put there in different levels?

Try to add a mine in r1 without writting 6 in disable ressources, and you'll see what happen

thanks if you answer some of this questions.