1. A method comprising: executing, by one or more computer processors, a software program, the software program requiring one or more physical interactions with a user through an input/output (I/O) device, wherein each of the one or more physical interactions includes respective predefined dimensions indicating a proficiency in performing one of the one or more physical interactions; tracking, by the one or more computer processors, the one or more physical interactions; generating, by the one or more computer processors, a familiarity profile for each of the one or more physical interactions based on the respective predefined dimensions for each of the one or more physical interactions; applying, by the one or more computer processors, a weighting parameter to the familiarity profile for each of the one or more physical interactions to generate an overall familiarity metric indicating an overall proficiency with the software program, a related software program, and an extent of customization for the software program; and customizing, by the one or more computer processors, the software program based on the familiarity profile for each of the one or more physical interactions.