A point I forgot in my post above - I said that the "good" QRs are the asymmetric ones. What I didn't say is that a few decades ago (I'm not sure exactly when; late '80s?) Shimano came up with a better cam shape that makes for a better lock and more resistance to accidental opening. My crash with the unexpected opening was the old Campagnolo QR. (1983, long before the new shape.) So - pass on ancient QRs - always. The old Campys were made beautiful and are good structurally for many more years. But your health and welfare is better served with an $8 QBP pair. The old straight levers also could be accidentally opened by stuff that the newer curved ones won't.
And a story re: QRs and other bikes - I talked of front wheels of other bikes coming in contact with rear quick releases. True story. I lead out a town line sprint coming off a small hill. The local hotshot came past close on my right and hooked over as soon as he cleared me to shed the newbie on his wheel. So, momentarily I was on the hotshot's wheel with the newbie beside me. OK. But the newbie knew he was on "the" wheel and wasn't willing to give it up so he simply came over too. By this time, his rear wheel was beside my front and coming into my line. I steered left. But that was only a temporary cure. I had to bring the bike back under my weight or crash hard at 30+ mph (remember that hill?) with a dozen riders on my wheel.
So I steered back to straight and simply muscled my wheel into his and pushed off. There was a loud (and to my sense of time, very long! sound of tearing metal. A huge wobble started instantly. We separated and I rode the bike gently to a stop. His QR left end had cut 8 consecutive spokes out of the front wheel right side and damaged a couple more. Thank G** I was riding Weinmann Concaves so stiff the rim and tire still made it through the fork. (Taking the paint to shiny steel on my brand new custom but I wasn't complaining!)
This story isn't about lever position other than I did not open his. (Thinking to note the position he used was NOT in my mind at the time. Sorry BF.
) But it does make the point that QR levers can come in contact with other bikes before the crash happens and that position could make a very big difference