Hmmm with any timed sporting event is it bad sportsmanship to run out the clock as to not allow the other team the chance? In football, would this be a topic of conversation at all? When softball uses a clock for games, then it becomes part of the game Strategy.
As a basketball coach, I don't have a problem with stalling or being stalled against in basketball, as it requires skill to both stall and/or defend against it. The kids - on both sides - learn something from it. As a softball coach I would never tell my kids to tie their shoes to kill time however. It's just a completely different deal in my eyes.