Should the engineers be able to build obstacles?

[P.Ako]

I guess my point is, what would be better than a poll is an idea on how the stuff would work which would have to follow the guideline of being simple to implement, elegantly thought out and non destructive to other titles.

As i said before i think that limiting the number of obstacles that you can lay and making it layable only by some type of engineers would do the trick. Don't you think?