One master catalogue for all the images, then use collections for each subject/shoot is the way the system is designed to work.You could say:
One catalogue to rule them all, one catalogue to find them, one catalogue to bring them all and in the Lightroom bind them!
Sorry it's very late here and all the detail that's been going around in my head on sampling theory thanks to the Optical AA filter thread has me a little La La at the moment. Guess I should stop re-reading Lord of the Rings for the umpteenth time too.
Alan

