My para doesn't exactly have a problem staying closed, but there's definitely not much resistance. Not an issue though, since it's tip down.
I often come away from blade forums feeling like there's a cruel joke being played at my expense. People really don't like ball detents, but I've got locks of tons of different types, and my two liner lock CRKTs hold the blade in better than any of them, including multiple axis, ball bearing locks, a compression lock, lockbacks...
But, in any case, kind of a non issue on tip down knives, in my opinion, unless it's REALLY easy to fall out, and the para is not among these...it's just not hard.
You can use the magnet, but I'm not sure how much I want a magnet riding with the other gear in my pocket.
If you're a multiple EDC fan looking to justify that next knife, use zip ties and cut them off with another knife when you need to use that one. Then you can justify the four+ blades crazy knife collectors carry. The two high powered LED flashlights, leatherman, palm pilot, razor phone, ipod, swiss card and 9mm handgun are still going to be hard to justify.