If everything else that was in the same container as the object with dummy behaviour, per dummy object, was aligned properly according to size and angle and everything at runtime on demand, that would be neat. But the uses here are become somewhat limited; it is probably best to simply event script these things as needed.
For this sort of object arrangement, it would be useful if there were a "This," or "picked object," etc to use in equations - instead of Object.X, operate more vaguely on the object that is currently being placed. Then an event could run through each object in a family, and set each of them up the same - that is, instead of setting the width, height, angle etc of objectA, objectB and objectC individually per dummy, to be able to, as it runs through each dummy object, also run through objectA, B and C as a family and orient each, with the same few events.
If there is already some way to do it, using containers or something, that would be cool. I keep reading that things done to one object in a container are done to all other objects in that container, but does this also include positioning, scaling and rotation? Maybe I have just not tested this thoroughly enough, hmm...