Hey,
This may have been brought up. In the Assemblies application, in the Move Component dialog, you can select to copy the item you are moving. It would be cool if this functionality were added to the Assembly Constraint tool as well. Picture a screw you just constrained into place. Now there are 10 more holes that need screws. You could, via several methods, copy and paste 10 unconstrained screws into the assembly and then constrain them individually. Alternatively, as I am suggesting, it would be cool if you could select "Copy with Constraints" or some such option with the Assembly Constraints dialog, which when you selected Concentric and the two defining faces/edges (one on the original part and one on the next hole), the new, copied part would pop into place. Perhaps using the Add Component>By Constraints functionality is just as efficient. Even better would be, if all the 10 holes were identical, a "Copy Part with Constraints" (similar to Copy with Mates from Solidworks, but ideally more powerful in that it figures out the edges and faces to constrain to) tool would allow you to select first the part to be copied and the salient mating feature, i.e. the first hole, and then select the other 10 holes and bam, the screws pop into place.
I'll get back to work now, cheers,
Alex