I basically agree with
marchone
and most any frame lock I've handled will move inward when pressing hard enough on it. In my hands, due either to their to their thickness or my arthritis, simply gripping tightly doesn't tend to move the lockbar inward, but I can certainly effect that deliberately. As has been discussed at least a couple times earlier in this thread, by my estimation Shiros seem to have shallower angled lockbar ramps on their blade tangs and it's easier to move the lock further in with pressure than with other knives. Shiros also have shouldered lockbars (some refer to this feature as the "Shiro shelf") and I've wondered if the shallower blade ramp isn't a deliberate safety feature to allow deeper lock-up under hard use and the shouldered bar a positive overtravel stop on knives that generally have very early lockup.
I would also mention that none of my Shiro locks have moved significantly after considerable use and innumerable fidget flips other than the one knife I deliberately tweaked to get a little later.