Today you can drag a ipt/iam over or under another part or assembly in the model tree. But to drop into an assembly you must first expand it. This is chaotic. I propose that by holding a key down you can directly drop the ipt/iam into the assembly, without expanding the new parent assembly. No key press would work too. Just a highlight after waiting to signal a different action or to make sure user actually wants to drop it into the new parent assembly.
