Replying to your question as to whether it is used in any/all of the presets in non-PRO versions, or is it something one has to do for ones' self, here is how I would answer your question:
Regarding Presets, the Beta testers have input as to how a given preset is constructed -- it may or may not have some configuration of hammer hardness variation across the keyboard. Whatever way the preset is finalized, it is available to all versions of Pianoteq, from Stage to Pro version.
Something that I prefer to do myself is to "age" the piano slightly with my own custom presets. Of course this is what gave rise to the "Condition Slider" in the screen view; rather than use someone else's concept of "aging", I prefer to do a little of my own "aging" as the result of decades of tuning pianos in all types of condition -- ranging from brand new to almost-ready-for-the-junk-bin -- and everything in between.
Specifically, I notice that notes in the three- or four-octave "grand staff" get physically played most often often, I slightly increase per-note hammer hardness in this same grand staff. I also slightly detune the notes in this range (not enough to be noticeable) and then randomize them. Although not related to hammer hardness, I tend to increase the damping times in lower notes (because more massive strings have greater inertia to bring to a stop via damping). Finally, I slightly increase and randomize the amount of action noise -- again, not enough to be distinctly heard, but it adds to the characteristic "feel" of an instrument that has been played some before I have gotten my fingers on it.
Hope this helps,