My practical experience with 109 slats (actually, Buchon, so late version and no, I haven't flown them - lol) is that on the ground they're very definitely either up or down. The mechanism doesn't seem to hint at any kind of balance anywhere in between, it's all up or all down. They do seem rather secure in the up position while on ground but I could imagine with a plane bumping around on the grass during takeoff they would likely pop down, but there would be contributing air loads going on as well, obviously.
It also struck me while I was fiddling with them that it might take a little less AoA to pop them back in that what popped them out. If so, that would reduce the chance of having them banging back and forth if one happened to be riding the magic AoA.
--- Let me know when I can groundloop a 109 (or anything else, for that matter - lol) in game. ---
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