I'm not a medico so this is anecdotal not medical - both my nephews had a lot of laxity in their joints - esp. the older one. One of them (I'm sorry, I forgot which one) as a quite young boy (maybe 4 or 5) dislocated his elbow just by being contrary and pulling away while his hand was being firmly held (you know what I mean). Once it happened the first time, it was easier to happen at odd times. When the older one was in high school and playing sports (water polo and wrestling) his shoulder kept slipping out while playing WP - he had it surgically "tightened up" over one summer so that he could continue but missed that next wp season and ended up finishing out the last two years doing just wrestling.
I'd not worry about it - but it is something that it is good to know about and keep an eye on I think -- but that's my amateur opinion - I also think it is something where it can't be a good thing to keep doing it at will - but again, I've got no medical reason for that, just a hunch - shoulders are supposed to be stable after all.
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