Rastoff:
Thanks for the correction - I really gotta get one of those

....
(I've been trying to save a couple bucks to get the necessaria to add .40S&W to my Dillon, and every time I get close, the wife needs something. Last week, the car needed a Shield's worth of repairs. My car, but she's afraid to drive hers for other reasons, so she had to replace a tire and a wheel.... I'd drive it that way for a year if it was up to me

....)
To agree with both of us, I really would worry about something switching that safety on for me.... The one on my 9C is very easy to swipe off (or on), and wouldn't bother me, but from what I hear, "impossible" isn't right, but "darned difficult" is. Reminds me of my old S&W "Escort" toy - "M61", I think - little bitty .22LR semi-auto. The safety lever is nearly impossible even when you want to switch it's selection. Not stiff or anything, but teensy and a little hard to find in a hurry. You can't carry that thing with the safety off.
The two M&P's that I actually carry, btw, have no thumb safeties. It's a bit disconcerting to not find them when I "present" in practice, but at least it's not going to fail to work properly. Brain goes "oops, forgot this thing didn't need that move", which is a heck of a lot safer (and quicker) than "oops, where's that fool lever?".
BTW, that's one of the downsides to an LDA gun from Para - the hammer will come back whether the safety's on or off, but it won't drop. No feedback ("yikes, that trigger's stiff") if it's on, and I think you could break something if you pulled hard enough.
("LDA" is Para's "Light Double Action". Really advertising hype, but a vestigal hammer lies against the rear of the slide unless you start squeezing the trigger. Do that, and the hammer will come back. If the thumb safety is off, it'll fire. Unless you carry on an empty chamber, the firing mechanism is cocked for you when you load the chamber, and it's impossible to avoid that, or uncock it without firing the gun, or at least dropping the magazine and cycling the round out.)
(Actually, pretty nice if you're an old wheelgun guy.)
Regards,