Shortcut Enter structure

[Erik Springelkamp]

I am sure that I have been playing AGEOD games where I could enter and leave structures using a short-cut key.
It is necessary if a region is full of stacks so you can no longer drop your stack into the structure without merging it with another stack.

I am almost certain that the key was <H> and the game was ROP.

But today I am playing ROP gold, and the key doesn't work, neither do variations with shift and alt.

And the documentation doesn't mention this key.

So which AGEOD games have this key or are supposed to have this key?