@fingaroff, the same case would be with Tennis and all sports oriented workouts. At the moment, you cannot add shoes to them. Be sure we have been passing all your requests along and that as soon as we know something new we'll let you know.
The number of cubes within your status image is determined by your activity on the miCoach support website. These activities include (in order of importance):
Having a response to a discussion post marked as the correct solution.
Responses which are marked as helpful by other users.
