When doing post game analysis, the tracker will offer just about any stat you want. However, seeing the flop OOP isn't a stat I would worry about.
Notice I mentioned post game analysis. Unless I set my HUD up for it, it is not a normal stat to see.
PT4 shows me the same stats about my play as it shows me about others play. It shows me how many games I have played against each individual and the tendencies they have shown over that period.
While I'm pretty sure there are a few players out there who have configured their Tracker/Hud to show them some very out of the norm stats, most (I suspect) wouldn't vary much from the standard set ups. And how often I see a flop OOP is not a normal stat for a HUD to display.
VPIP is a more important stat, and pretty much incorporates that OOP concept. So, if I notice my VPIP is higher or lower than normal, I get the idea....