Dribbling ball on endline throw in?

[twarner]

Can the thrower bounce pass or dribble along the endline when his team is allowed to run the endline? We would call a violation if the thrower hit the sideline. Should we call a violation if it hit the endline, and if so, should we then not allow a bounce pass or dribble across the baseline? The high school book says only a direct throw in or pass is allowed.