Duncan
Definitely NOT a daft question at all.
On my last layout I installed magnets under the track, flat plate approx 50mm x 40mm, worked ok, but you are quite correct in your assumption of some unwanted uncoupling.
Then I built a "test track" to practice my track building skills & incorporated a couple of electro-magnetic uncouplers, FANTASTIC is my opinion of them, granted there's a bit more work to fitting them as they go UNDER the track, but are totally hidden when ballasted and no more stray wagons.
There are also magnets that sit between the sleepers, but I've not used those at all.
I did get some of Bachmann's equivalent of the Kadee, but not a patch on the genuine thing.
Jeff
PLEASE keep them foto's coming, Bodgit's not the only one who looks at the pictures!!
Chip.