I don't know if that's a bug...
It's called the Hard Hat Trick. You need it to solve
some of Rockford4ever's levels.
You also need it to solve some of the levels in the set
Ryan Pineda - Bomb Levels under
Contributions 2003. For example, look at level 2.
Is this possible to do under the Emerald Mine Engine? I can't tell, because I never figured out exactly how to time this trick...
Anyway, if this bug is not an Emerald Mine bug and is fixed, I hope that a compatibility is added, or an option, but it would look very strange having an option that says "ALLOW HARD HAT", and everybody would ask on the forum what that means.
If anybody asks, point them to this topic using this link:
viewtopic.php?t=975#6535