Erika,
Thank you for your feedback.
If this criteria could be integrated in the search & select tool it would work with other existing criteria...
So if I would need to detect clashes I'd need to narrow the search...
In my example "Structural vs plumbing"... I'd first add 2 layer criteria... The Structural layer and the Plumbing layer...
At first... Just this would prevent lots of inappropriate clash collisions...
But then there was a problem... For example... I have lots of pipe objects that clash between themselves...
Even if they were in the plumbing layer... the gazilion clashes would still be detected...
I guess that your " user-defined system sets" could be the solution...
First you would need to define an unlimited number of "System sets"...
And AC would handle all the elements in the "System set" as a single geometry...
That would prevent those unwanted clashes...
But this would need a more elaborated criteria in the search & select tool...
Like a drop down... or perhaps a new tool...
My hunch is that this is viable...
But as you said... only the GS software team could put light over this matter...
p.s.: I thought about the clashes between elements in the same layer and came up with an idea...
Why not a "Clash filter" in the clash criteria?...
With this parameter... the clash detector could ignore clashes between elements with the same layer, ID, Material, etc...