Not entirely sure what you mean, assuming the Analyze (Edit) Action vs Activity Pages. If not please update the description.
You need HighScore to use PerformancePredictor for multiple activities, otherwise the action is greyed out (the only other reason to not include it in the menu is that there is no activities). The issue in ST2 is that you need to install it in a specific path.
However, a new build uploaded with a visual style more corresponding with core ST tables (dates are incorrect in the web page). Overlay/PerformancePredictor/HighScore Activity Page also enabled for multiple activities in ST3.
ST plugin version not bumped
(ST2 builds updated too)